Diatoms of Europe : diatoms of the European inland waters and comparable habitats. Volume 4, Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella / Kurt Krammer ; edited by Horst Lange-Bertalot.    Ruggell :  A.R.G. Gantner Verlag K.G.,  2003 . 530 s.