By Henk Vos   E. de Graaff   in European Journal of Engineering Education

ISSN:1469-5898|29|4|543-548

Taylor & Francis Ltd‎(2004)‎

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By Nzeyimana Innocent   Hartemink Alfred E.   de Graaff Jan   in Outlook on Agriculture

ISSN:0030-7270|42|1|47-52

IP Publishing Ltd‎(2013)‎

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