@INBOOK {ORTIZ:1994, title = {Morphology and tuber characteristics}, author = {Ortiz, R. and Huaman, Z. }, editor = {Bradshaw, J. E. and Mackay, G. R. }, year = {1994}, type = {Potato genetics}, pages = {263--283}, publisher = {CAB International}, address = {Wallingford, Oxon, UK.}, }