00383nam a2200145Ia 4500008004100000020001500041082001600056100002000072245003800092260005100130300000800181650001800189650001800207653001200225170901s1968    xx            000 0 und d  a0226505057  a574.5bM32P  aMargalef, Ramon 0aPerspectives in Ecological Theory  aChicagobThe University of Chicago Pressc1968  a111  aLife sciences  aPure Sciences  aEcology