TY - JOUR T1 - Historical perspectives and a focus on fitness. JO - Behav Processes PY - 2007/10/01 AU - Hatchwell BJ ED - DO - DOI: 10.1016/j.beproc.2007.01.011 VL - 76 IS - 2 SP - 73 EP - 74 Y2 - 2024/12/22 ER -