Viriya Pankao. (2000) Spermatogenesis and chromatin condensation in the male germ cells of the giant African snail, Achatina fulica bowdich. Mahidol University,:ม.ป.ท.Viriya Pankao. 2000. Spermatogenesis and chromatin condensation in the male germ cells of the giant African snail, Achatina fulica bowdich. ม.ป.ท.:Mahidol University,;Viriya Pankao. Spermatogenesis and chromatin condensation in the male germ cells of the giant African snail, Achatina fulica bowdich. ม.ป.ท.:Mahidol University, 2000. Print.