1. Optimal foraging; some theoretical explorations;Charnov,1973
2. The role of time and energy in food preference;Emlen;Am. Nat,1966
3. The winter feeding ecology of the redshank, Tringa totanus;Goss-Custard;Am. Nat,1969
4. Factors affecting the diet and feeding rate of the redshank (Tringa totanus);Goss-Custard,1970