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Biological Nitrogen Fixation > Volume 2 > 21 - 38
Veterinary Microbiology > 2002 > 90 > 1-4 > 209-227
Studies in History and Philosophy of Biol & Biomed Sci > 2001 > 32 > 2 > 203-219
Reviews in Fish Biology and Fisheries > 1999 > 9 > 4 > 325-352