Cocquyt, C., Kusber, W.-H. and Jahn, R. (2008) “Otto Müller’s Surirella taxa (Bacillariophyta) from East Africa, based on a historical collection kept at the Botanic Garden and Botanical Museum Berlin-Dahlem (B)”, Afrika Focus, 21(1). doi: 10.21825/af.v21i1.5049.