Kittikorn Nakprasit. (2010) Strong-edge colorings in graphs. Khon Kaen University:ม.ป.ท.Kittikorn Nakprasit. 2010. Strong-edge colorings in graphs. ม.ป.ท.:Khon Kaen University;Kittikorn Nakprasit. Strong-edge colorings in graphs. ม.ป.ท.:Khon Kaen University, 2010. Print.