By Wessels R.H.A.   in Interlending & Document Supply

ISSN:0264-1615|23|3|18-21

Emerald Group Publishing Ltd‎(1995)‎

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By Nuboer J.F.W.   Wessels R.H.A.   in Netherlands Journal of Zoology

ISSN:1568-542X|25|4|398-406

Brill‎(1974)‎

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