(Visegrad Agenda 21)", Institute for Environmental Policy, Prague, 2002, 49. p.* Laki, G., Szakál, F. (2002): Added Value as a key indicator for sustainable agriculture.
(Visegrad Agenda 21)", Institute for Environmental Policy, Prague, 2002, 49. p.*Laki, G., Szakál, F. (2002): Added Value as a key indicator for sustainable agriculture.