By Chen J.   Friesen D.K.   Zheng H.   in Journal of Computer and System Sciences

ISSN:0022-0000|58|3|622-640

Academic Press‎(1999)‎

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By Oberson A.   Friesen D.K.   Rao I.M.   Bühler S.   Frossard E.   in Plant and Soil

ISSN:0032-079X|237|2|197-210

Springer Publishing Company ‎(2001)‎

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By Friesen D.K.   Rao I.M.   Thomas R.J.   Oberson A.   Sanz J.I.   in Plant and Soil

ISSN:0032-079X|196|2|289-294

Springer Publishing Company ‎(1997)‎

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