Hartmann, E., Keeling, L.J., Rundgren, M., 2011. Comparison of 3 methods for mixing unfamiliar horses (Equus caballus). Journal of Veterinary Behavior: Clinical Applications and Research 6, 39-49.

Hartmann, E., Christensen, W.J., Keeling, L.J., 2011. Training young horses to social separation: Effect of a companion horse on training efficiency. In publication, Equine Veterinary Journal.

Jørgensen, G.H.M., Fremstad, K.E., Mejdell, C.M., Bøe, KE., 2011. Separating a horse from the social group for riding or training purposes – a descriptive study of human-horse interactions. Animal Welfare 20, 271-279.

Winther Christensen, J., Søndergaard, E., Thodberg, K., Halekoh, U., 2011. Effects of repeated regrouping on horse behaviour and injuries. Accepted for publication in Applied Animal Behaviour Science.

Jørgensen, G.H.M., Liestø, S.H.O., Bøe, K.E., 2011. Effects of enrichment items on activity and social interactions in domestic horses (Equus caballus). Applied Animal Behaviour Science 129, 100-110. (in combination with other external funding)

Hartmann, E., Søndergaard, E., Keeling, L.J., 2011. Keeping horses in groups: a review. Accepted for publication in Applied Animal Behaviour Science.

Hartmann, E., Søndergaard, E., Keeling, L.J., 2011. Identifying potential risk situations for humans when removing horses from groups. Submitted to Applied Animal Behaviour Science.

Hartmann, E., 2010. Managing horses in groups to improve horse welfare and human safety: reactions to mixing and separation. Dissertation, Swedish University of Agricultural Sciences, Uppsala (ISSN 1652-6880).

Mejdell CM, Jørgensen GHM, Rehn T, Fremstad K, Keeling L, Bøe KE., 2010. Reliability of an injury scoring system for horses. Acta vet scand. 52, 68.

Jørgensen, G.H.M., Liestø, S.H.O., Bøe, K.E., 2010. Use of different items of ‘‘enrichment’’ for individual and group kept horses. Journal of Veterinary Behavior 5, 216. (in combination with other external funding)

Jørgensen, G.H.M., Borsheim, L., Mejdell, C.M., Søndergaard, E., Bøe, K.E., 2009. Grouping horses according to gender - effects on aggression, spacing and injuries. Applied Animal Behaviours Science, 120, 94-99.

Hartmann, E., Christensen, W.J., Keeling, L.J., 2009. Social interactions of unfamiliar horses during paired encounters: Effect of pre-exposure on aggression level and so risk of injury. Applied Animal Behaviour Science, 121, 214-221.

Fremstad, K.E., 2007. Horses kept in groups – is removing a horse for riding purposes and injuries a problem? Master thesis at the Department of Animal- and Aquacultural Sciences, Norwegian University for Life Sciences.

Borsheim, L., 2008. Grouping horses (Equus caballus) according to gender – effects on social interactions and spacing. Master thesis at the Department of Animal- and Aquacultural Sciences, Norwegian University for Life Sciences.

Geijer, J., 2010. Safety aspects of taking horses into and out of pastures and paddocks: focus on gate     design and placement. Master thesis at the Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Uppsala, Sweden. (in combination with other external funding)

Mejdell, C.M., Jørgensen, G.H.M., Rehn, T., Keeling, L., Fremstad, K., Bøe, K.E., 2011. Injury recording in horses kept in groups. NJF seminar 437, Housing and management of horses in Nordic and Baltic climate, 6-7 June 2011, Iceland.

Hartmann, E.1, Norling, Y.1, Rundgren, M.1, Søndergaard, E.2, Christensen, J.W.3, Jørgensen, G.4, Bøe. K.4, Mejdell, C.5, Hyyppä, S.6, Sarkijarvi, S.6, Ladewig, J.7, Keeling, L.J., 2011. Nordic survey of management practices and owners attitudes towards keeping horses in groups. NJF seminar 437, Housing and management of horses in Nordic and Baltic climate, 6-7 June 2011, Iceland.

Mejdell. C.M., Jørgensen, G.M.H., Bøe, K.E., Søndergaard, E., Winther Christensen, J., Hyyppä, S., Hartmann, E., Keeling, L.., 2011. Gruppehold av hester – resultater fra et nordisk forskningsprosjekt. In: Husdyrforsøksmøtet, ISBN 978-82-7479-024-7, pp. 530-533.

Hartmann, E., Christensen, W.J., Keeling, L.J., 2010. Two methods of training naive horses to social separation. Does the presence of a companion increase training efficiency? In: Proceedings of the 6th International Equitation Science Conference, Uppsala, Sweden, p 41.

Søndergaard, E., Jørgensen, G., Hartmann, E., Hyyppä, S., Mejdell, C., Christensen, W.J., Keeling, L.J., 2010. Group housing horses under Nordic conditions. In: Proceedinsg of the 61st Annual Meeting of the European Association for Animal Production, Heraklion, Greece, p 295.

Keeling, L.J., Søndergaard, E., Hyyppä, S., Boe, K., Jørgensen, G., Mejdell, C., Ladewig, J.,   Särkijärvi, S., Janssen, H., Rundgren, M., Hartmann, E., 2010. Group housing of horses under Nordic conditions: strategies to improve horse welfare and human safety. In: Proceedings of the 44th Congress of the International Society for Applied Ethology, Uppsala, Sweden, p 102.

Hartmann, E., Keeling, L.J., Rundgren, M., 2010. Effects of three methods for mixing unfamiliar horses on their potential to minimise aggressive interactions. In: Proceedings of the 44th Congress of the International Society for Applied Ethology, Uppsala, Sweden, p 79.

Borsheim, L., Jørgensen, G.H.M., Mejdell, C.M., Søndergaard, E., Bøe, K.E., 2009. Gruppering av hester etter kjønn – effekter på sosiale interaksjoner, avstand   mellom dyr og skader. In: Proceedings of the Norwegian Animal Science Meeting 2009, Arena Hotel Lillestrøm, pp 283-286.

Søndergaard, E., Christensen, J. W., 2009. Stable versus unstable groups of horses –effects on social behaviour and injuries. In: Proceedings of the 21st Nordic Symposium of the International Society for Applied Ethology, Bjerringbro, Denmark, p 20.

Hansson, K., Søndergaard, E., Ladewig, J., 2009. Grouping horses according to age – effects on social behaviour. In: Proceedings of the 21st Nordic Symposium of the International Society for Applied Ethology, Bjerringbro, Denmark, p 19.

Jørgensen, G.H.M., Fremstad, K.E., Mejdell, C.M., Bøe, K.E., 2009. Gruppehold av hest – håndtering ved uttak og skader. In: Proceedings of the Norwegian Animal Science Meeting 2009, Arena Hotel Lillestrøm, pp 207-210.

Hartmann, E., Christensen, W.J., Keeling, L., 2008. Evaluating social encounters between unfamiliar horses. In: Proceedings of the 20th Nordic Symposium of the International Society for Applied Ethology, Oscarsborg, Norway, p 30.

Borsheim, L., Jørgensen, G.H.M., Mejdell, C.M., Bøe K.E., 2008. Grouping horses according to gender – effects on social interactions and spacing. In: Proceedings of   the 20th Nordic Symposium of the International Society for Applied Ethology, Oscarsborg, Norway, p 32.

Fremstad, K.E., Jørgensen, G.H.M., Mejdell C.M., Bøe K.E., 2008. Keeping riding horses in groups – are there really any problems with injuries, and are such horses difficult to catch? In: Proceedings of the 20th Nordic Symposium of the International Society for Applied Ethology, Oscarsborg, Norway, p 42.

Hartmann, E., Christensen, W.J., Keeling, L.J., 2008. Evaluating social encounters of horses during mixing. In: Proceedings of the 42nd Congress of the International Society for Applied Ethology, Dublin, Ireland, p 220.

Jørgensen, G.H.M., Fremstad, K.E., Mejdell, C.M., Bøe, K.E., 2008. Keeping riding horses in groups – a descriptive study on the common procedure of separating a horse from the group for riding or training purposes. In: Proceedings of the 4th International Equitation Science Conference, Dublin, Ireland, p 81.

Jørgensen, G.H.M., Borsheim, L., Mejdell, C.M., Søndergaard, E., Bøe, K.E., 2008. Social interactions and spacing in horses (Equus caballus) grouped according to gender. In: Proceedings of The international Equine Science Meeting, Regensburg, Germany. p 25.

Keeling, L., Bøe, K.E., Hartmann, E., Jansson, H., Jorgensen, G.H.M., Ladewig, J., Mejdell, C., Rundgren, M., Søndergaard E., Christensen, W.J., 2007. Group housing and managing horses under Nordic conditions: strategies to improve horse welfare and human safety. In: Proceedings of the 19th Nordic Symposium of the International Society for Applied Ethology, Skara, Sweden, p 26.

Mejdell, C.M. Jørgensen, G.H.M., Bøe, K.E., 2007. Gruppehold av hester: Et nordisk forskningsprosjekt. In: Proceedings of the Norwegian Animal Science Meeting 2007, pp 351-354.

Hartmann, E., 2010. Överdriven skaderisk för hästar i grupp. Tidningen Ridsport.

Hartmann, E., 2010. Liten skaderisk för hästar i flock. Hästmagazinet.

Hartmann, E., 2010. Hästar behöver social kontakt. Notiser från SLU, Sveriges lantbruksuniversitet, ISSN: 1104-0505, p 2.

Meisfjord-Jørgensen, G., 2007. Hestene på vei tilbake til flokken. Hesteliv 4, 28-31.

Meisfjord-Jørgensen, G., Mejdell, C. 2007. Gruppehold av hester - hvordan få dette til å fungere? Hestesport 6, 72-73.

Meisfjord-Jørgensen, G., Søndergaard, E., 2008. Heste kan sagtens holdes i grupper. Magasinet hest, Juni, 38-40.

Mejdell C. Hest på utegang. Tun forlags håndbok nr. 21. Tun Forlag AS 2007. Valdres Trykkeri as. ISBN: 978-82-529-3179-2.