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No-tillage cultivation of soybean and future research needs in South America : Proceedings of the seminar held in Foz do Iguaçu, Brazil and Yguazu District, Paraguay on March 5 and 6, 1998. Kokubun M. (ed.). 1998. Tsukuba, Ibaraki : JIRCAS, 118 p. (JIRCAS Working Report, 13) Seminar on No-Tillage Cultivation of Soybean and Future Research Needs, Foz do Iguaçu, Brésil, 5 Mars 1998/6 Mars 1998.