By van der Steen W.J.   in The Journal of Value Inquiry

ISSN:0022-5363|33|1|11-29

Springer Publishing Company ‎(1999)‎

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By Van Der Steen W.J.   in Archives Néerlandaises de Zoologie

ISSN:1875-3019|17|4|403-468

Brill‎(1966)‎

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By Van Der Steen W.J.   in Netherlands Journal of Zoology

ISSN:1568-542X|18|3|411-414

Brill‎(1967)‎

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By Van Der Steen W.J.   Van Den Hoven N.P.   Jager J.C.   in Netherlands Journal of Zoology

ISSN:1568-542X|19|1|131-139

Brill‎(1968)‎

Access to resources Favorite 13.457638

By Mooij-Vogelaar J.W.   Jager J.C.   Van Der Steen W.J.   in Netherlands Journal of Zoology

ISSN:1568-542X|20|2|279-288

Brill‎(1969)‎

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