Sudsiri Katatikorn. (1999) Effects of neem seed kernel extract on bradyrhizobium species cultures and on Bradyrhizobium species nitrogen firation and nodulation of yard-long bean (Vigna sinensis Var. Sesquipendalis). Mahidol University,:ม.ป.ท.Sudsiri Katatikorn. 1999. Effects of neem seed kernel extract on bradyrhizobium species cultures and on Bradyrhizobium species nitrogen firation and nodulation of yard-long bean (Vigna sinensis Var. Sesquipendalis). ม.ป.ท.:Mahidol University,;Sudsiri Katatikorn. Effects of neem seed kernel extract on bradyrhizobium species cultures and on Bradyrhizobium species nitrogen firation and nodulation of yard-long bean (Vigna sinensis Var. Sesquipendalis). ม.ป.ท.:Mahidol University, 1999. Print.