Hebert, Paul D N ENZYME VARIABILITY IN NATURAL POPULATIONS OF DAPHNIA MAGNA I. POPULATION STRUCTURE IN EAST ANGLIA. [electronic resource] - Evolution; international journal of organic evolution Dec 1974 - 546-556 p. digital Publication Type: Journal Article ISSN: 1558-5646 Standard No.: 10.1111/j.1558-5646.1974.tb00788.x doi