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Mechanizăm za povišavane efektivnostta na obštestvenoto proizvodstvo
Kinov, Dimităr V., (1984)
Public attitudes to economic policy in East and West : efficiency, subsidies and public ownership
Sikora, Joanna, (2005)
Conference on Economic Efficiency and Industrial Property Protection : Budapest, 13-17 september, 1982 : [proceedings of the Hungarian Association for the Protection of Industrial Property and the Hungarian Group of the International Association for the Protection of Industrial Property]
Ujfalussy, Charlotte, (1983)