, ?Vivipary and pseudovivipary in the Poaceae, including the first record of pseudovivipary in Digitaria (Panicoidea: Paniceae)?, South African Journal of Botany, vol. 72, pp. 559-564, 2006.

P. D. F.  Kok, ?Studies on Digitaria (Poaceae) I. Enumeration of species and synonymy?, South African Journal of Botany, vol. 3, pp. 184-185, 1984.

P. D. F.  Kok, Robbertse, P. J., and van Wyk, A. E., ?Systematic study of Digitaria section Digitaria (Poaceae) in southern Africa?, South African Journal of Botany, vol. 55, pp. 141-153, 1989.

G.  Davidse, Hoshino, T., and Simon, B. K., ?Chromosome counts of Zimbabwean grasses (Poaceae) and an analysis of polyploidy in the grass flora of Zimbabwe?, South African Journal of Botany, vol. 52, pp. 521-528, 1986.