6Popluga, D, and Z Gaile. "Beef consumption trends in Latvia.."Annual 15th International Scientific Conference Proceedings" Research for Rural Development 2009", Latvia University of Agriculture, . Jelgava, May 20-22 , 2009.
7Zaidi, Asghar, Mattia Makovec, Michael Fuchs, Barbara Lipszyc, Orsolya Lelkes, Marius Rummel, Bernd Marin, and Klaas Vos. "Mainstreaming Ageing."(2007) Mainstreaming Ageing: Indicators to Monitor Sustainable Policies.