Jamaati-e-Somarin, S.; Tobeh, A.; Hashemimajd, K.; Hassanzadeh, M.; Saeidi, M.; Zabihi-e-Mahmoodabad, R. Effects of Nitrogen Fertilizer and Plant Density on N-P-K Uptake by Potato Tuber. Indian J. Hortic. 2010, 67, 329-333.