Napanporn Vallapa. 2006. Preparation and antibacterial activity of quaternary ammonium-containing chitosan surface. Faculty of Science, Chulalongkorn University;
Napanporn Vallapa. (2006) Preparation and antibacterial activity of quaternary ammonium-containing chitosan surface . Chulalongkorn University/Bangkok.
Napanporn Vallapa. Preparation and antibacterial activity of quaternary ammonium-containing chitosan surface. . Bangkok:Chulalongkorn University, 2006.
Napanporn Vallapa. (2006) Preparation and antibacterial activity of quaternary ammonium-containing chitosan surface . Chulalongkorn University/Bangkok.