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Tay, Chong Seng (1979). Evolutionary studies on the cultivated diploid potatoes - Solanum stenotomum Juz. et Buk., S. goniocalyx Juz. et Buk. and S. phureja Juz. et Buk. University of Birmingham. Ph.D.
Huaman, Zosimo (1976). The origin and nature of Solanum ajanhuiri Juz. et Buk.: a South American cultivated diploid potato. University of Birmingham. Ph.D.