Estimating the functional form for the density dependence from life history data - Coulson, T; Ezard, THG; Pelletier, F; Tavecchia, G; Stenseth, NC; Childs, DZ; Pilkington, JG; Pemberton, JM; Kruuk, LEB; Clutton-Brock, TH; Crawley, MJ (ECOLOGY, 2008)