P. Karna, “Cytological Studies on Two Species, Xanthium strumarium Linn. and Bidens pilosa Linn. Var. minor (Blume) Sherff (Asteraceae-Heliantheae) from Nepal”, Int J Appl Sci Biotechnol, vol. 5, no. 1, pp. 66–71, Mar. 2017, doi: 10.3126/ijasbt.v5i1.17010.