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Author | Title | Year | Publication | Serial | Volume | Pages |
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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 |