S. N. Nguluu, J. K. Itabari, B. M. Ikombo, J. M. Wambua, and E. M. Gichangi, “SESSION III – IRRIGATION, DRAINAGE AND WATER HARVESTING - Water application methods and water use efficiency for tomatoes production in the semi-arid areas of eastern Kenya”, East. Afr. Agric. For. J., vol. 65, no. 1, pp. 51–56, Jan. 2004.