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Author (up) Title Year Publication Serial Volume Pages
Friedrich, A.M.; Zentall, T.R. Pigeons shift their preference toward locations of food that take more effort to obtain 2004 Behavioural processes 227 67 405-415
Gutierrez Rincon, J.A.; Vives Turco, J.; Muro Martinez, I.; Casas Vaque, I. A comparative study of the metabolic effort expended by horse riders during a jumping competition 1992 British Journal of Sports Medicine 3754 26 33-35