Reference

Friedrich Ehrendorfer, Ilse Silberbauer-Gottsberger, Gerhard Gottsberger (1979): Variation on the Population, Racial, and Species Level in the Primitive Relic Angiosperm Genus Drimys ( Winteraceae) in South America – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 132: 53 - 83.