S. S.  Gilani, Khan, M. A., Shinwari, Z. K., Hussain, F., and Yousaf, Z., ?Taxonomic relationship of the genus Digitaria in Pakistan?, Pak. J. Bot, vol. 35, no. 3, pp. 261 - 278, 2003.

M. Q.  Hayat, Ashraf, M., Khan, M. A., Yasmin, G., Shaheen, N., and Jabeen, S., ?Phylogenetic analysis of Artemisia L. (Asteraceae) based on micromorphological traits of pollen grains?, Afr. Journ. Biotechn, vol. 8, no. 23, pp. 6561 - 6568, 2009.