Jittima Pimbua. (1989) Mutagenic tests of stevioside and steviol. Mahidol University,:ม.ป.ท.Jittima Pimbua. 1989. Mutagenic tests of stevioside and steviol. ม.ป.ท.:Mahidol University,;Jittima Pimbua. Mutagenic tests of stevioside and steviol. ม.ป.ท.:Mahidol University, 1989. Print.