Gatzweiler, Franz W.; Backman, Stefan; Sipilainen, Timo; Zellei, Anett(Sustainable Agriculture in Central and Eastern European Countries (CEESA), Humboldt University, Berlin, Germany, 2001)
Emtairah, Tareq; Echavarria, Marta; Hamann, Ralph(United Nations Environment Programme Finance Initiative (UNEP FI); Stockholm International Water Institute (SIWI), Sweden, 2005)