Theesfeld, Insa(Central and Eastern European Sustainable Agriculture (CEESA), Humboldt University of Berlin, Department of Agricultural Economics and Social Sciences, Berlin, Germany, 2001)
Hukkinen, Janne; Müller-Wille, Ludger; Heikkinen, Hannu(Department of Civil and Environmental Engineering, Laboratory of Environmental Protection Publication, Helsinki University of Technology, 2003)
Sumelius, John; Grgic, Zoran; Mesic, Milan; Franic, Ramona(Sustainable Agriculture in Central and Eastern European Countries (CEESA), Berlin, Germany, 2002)