Vorapot Raksang. (1993) The use of rice husk ash for silk degumming. Mahidol University,:ม.ป.ท.Vorapot Raksang. 1993. The use of rice husk ash for silk degumming. ม.ป.ท.:Mahidol University,;Vorapot Raksang. The use of rice husk ash for silk degumming. ม.ป.ท.:Mahidol University, 1993. Print.