Reference

Raymond J. Lewis, Susan I. Jensen, Dean M. DeNicola, Virginia I. Miller, Kyle D. Hoagland, Stephen G. Ernst (1997): Genetic variation in the diatom Fragilaria capucina (Fragilariaceae) along a latitudinal gradient across North America – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 204: 99 - 108.