REFERENCES
- SNOEIJS , P. J. M. , HÄLLFORS , G. and LESKINEN , E. 1991a . Taxonomy and ecology of Catacombas obtuse comb.nov . Diatom Research , 6 ( 1 ) : 155 – 164 .
- SNOEIJS , P. J. M. , HÄLLFORS , G. and LESKINEN , E. 1991b . The transfer of two epipsammic diatom species to the genus Martyana . Diatom Research , 6 ( 1 ) : 165 – 173 .