Reference

Siegfried Jost Casper, Wolfram Scheffler, Otto Augstein, Th. Peschke (1987): Some Observations on the Stephanodiscus hantzschii -group (Bacillariophyta) in Waters of the G .D .R . I. Stephanodiscus hantzschii and S. “ tenuis” in Lakes Wentow, Tollense, Haussee, and Bautzen Reservoir – Archiv für Protistenkunde – 134_1987: 17 - 34.