By Singhal R.N.   Dattagupta A.K.   in Netherlands Journal of Zoology

ISSN:1568-542X|32|2|263-281

Brill‎(1981)‎

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By Singhal R.N.   Davies R.W.   in Journal of Invertebrate Pathology

ISSN:0022-2011|67|1|100-101

Academic Press‎(1996)‎

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