Piladda Srisombat และ Kamsing Nonlapon. (2010) On the weak solutions of the compound Ultra-hyperbolic bessel equation /. Khon Kaen University,:ม.ป.ท.Piladda Srisombat และ Kamsing Nonlapon. 2010. On the weak solutions of the compound Ultra-hyperbolic bessel equation /. ม.ป.ท.:Khon Kaen University,;Piladda Srisombat และ Kamsing Nonlapon. On the weak solutions of the compound Ultra-hyperbolic bessel equation /. ม.ป.ท.:Khon Kaen University, 2010. Print.