00248nam a2200097Ia 4500008004100000082001600041100003300057245002400090260002800114300000800142140113s9999    xx            000 0 und d  a591.51   L8  a"Krebs, J.R. & Davies, N.B."  aBehavioural Ecology  a1978bBlackwellcOxford  a494