Bhattarin Saengfak และ Nuanphun Chantarasiri. (2010) Preparation of rigid polyurethane foam catalyzed by nickel and cobalt complexes. Chulalongkorn University:ม.ป.ท.Bhattarin Saengfak และ Nuanphun Chantarasiri. 2010. Preparation of rigid polyurethane foam catalyzed by nickel and cobalt complexes. ม.ป.ท.:Chulalongkorn University;Bhattarin Saengfak และ Nuanphun Chantarasiri. Preparation of rigid polyurethane foam catalyzed by nickel and cobalt complexes. ม.ป.ท.:Chulalongkorn University, 2010. Print.