By Boon J.M.   McClain R.L.   Breen J.J.   Smith B.D.   in Journal of Supramolecular Chemistry

ISSN:1472-7862|1|1|17-21

Elsevier‎(2001)‎

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By Schoor A. N. van   Naudé H.   Rensburg M. van   Pretorius E.   Boon J. M.   in Early Child Development and Care

ISSN:0300-4430|174|5|487-500

Routledge Ltd‎(2004)‎

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By van Schoor A. N.   Naudé H.   van Rensburg M.   Pretorius E.   Boon J. M.   in Early Child Development and Care

ISSN:0300-4430|175|7-8|621-634

Routledge Ltd‎(2005)‎

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