1. On the benefits of assortment-based cooperation among independent producers;Akcay;Prod. Oper. Manag.,2008
2. One cow, one vote?;Albaek;Scand. J. Econ.,1997
3. The selection of joint project by a consortium;Aloysius;J. Oper. Res. Soc.,1999
4. Arla Foods, 2015. Articles of Association of Arla amba. 〈http://www.arla.com/globalassets/arla-global/company-overview/investor/vedtagter-for-arla-foods-amba.pdf〉(Accessed January 11, 2016).
5. ATZ online, 2004. Being co-operative helps keep PSA independent. 〈http://www.atzonline.com/Aktuell/Interviews/35/50/Being-Co-operative-Helps-Keep-PSA-Independent.html〉(Accessed January 11, 2016)