Yusuf, Rahma Udu, et al. “The Effect of Point Mutations in Dihydrofolate Reductase Genes and Multidrug Resistance Gene 1-86 on Treatment of Falciparum Malaria in Sudan”. The Journal of Infection in Developing Countries, vol. 4, no. 02, Nov. 2009, pp. 061-9, doi:10.3855/jidc.630.