CARTER, John R., & Patrick DENNY 1992 (Feb.) Freshwater algae of Sierra Leone. IV. Bacillariophyceae: Part (iii). Diatoms from the Lake Sonfon region and from Lake Popei Nova Hedwigia 54(1/2): 159-211, incl. 11 pls., 1 table [incl. n.spp. in Caloneis, Cymbella, Eunotia, Gomphonema, Krasskella, Navicula, Neidium, Nitzschia, Pinnularia, Stauroneis, Surirella]