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Beeny, J.M. and Khoo, D.C.P. (1970) Preliminary investigations into the performance of different shaped blades for the rotary tillage of wet rice soil. Journal of Agricultural Engineering Research, 15 (1). pp. 27-33. ISSN 0021-8634, DOI https://doi.org/10.1016/0021-8634(70)90107-1.