Binalfew, T., N. Dechassa, and T. Tana. “Influence of Plant Spacing on Seed and Ware Tuber Production of Potato (Solanum Tuberosum L.) Cultivars Grown in Eastern Ethiopia”. Science, Technology and Arts Research Journal, vol. 4, no. 3, Sept. 2015, pp. 11-17, https://journals.wgu.edu.et/index.php/star/article/view/236.