By Grassl Richard F.   Johansen Carl A.   in Journal of Economic Entomology

ISSN:1938-291X|66|2|454-456

Entomological Society of America‎(1973)‎

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By Powers Robert   Craviotto Cathleen   Grassl Richard   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|41|4|501-514

Taylor & Francis Ltd‎(2010)‎

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