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Wanger and Felipe Zapara, 1982, Feild Evaluation of Reference Crops in the Study of Nirrogen Fixation by Legum es Using Isotope Techm ques 〔 J〕 Agron. George H. J .
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1982 Dinitrogen Fixation M easured by15 N Isotope Dillarion in 2 Canadian Soybean Cultivars 〔 J〕 Agron. R. J. Rennie,S. Dubet,J. B. Role and H. - H. Muenduel. J .