กลิ่นเอี่ยม จ. “The Applications of Fixed Point Theorems for Multi-Valued Mappings on a Metric Space with a Graph”. KKU Science Journal, vol. 41, no. 3, Sept. 2013, pp. 657-63, https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/249156.