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Jansen, H G P and Walker, T S and Barker, R (1990) Adoption Ceilings and Modern Coarse Cereal Cultivars in India. American Journal of Agricultural Economics, 72 (3). pp. 653-663. ISSN 0002-9092
Mueller, R A E and Jansen, H G P (1988) Farmer and farm concepts in measuring adoption logs. Journal of Agricultural Economics, 39 (1). pp. 121-124. ISSN 0021-857X