Sarush Yamolyong และ Damrong Thaveesaengsakulthai. (2007) Process improvement for fused biconic taper coupler manufacturing by using six sigma. Chulalongkorn University:ม.ป.ท.Sarush Yamolyong และ Damrong Thaveesaengsakulthai. 2007. Process improvement for fused biconic taper coupler manufacturing by using six sigma. ม.ป.ท.:Chulalongkorn University;Sarush Yamolyong และ Damrong Thaveesaengsakulthai. Process improvement for fused biconic taper coupler manufacturing by using six sigma. ม.ป.ท.:Chulalongkorn University, 2007. Print.