Reference

Krystyna M. Urbanska, Herbert Hurka, Elias Landolt, Barbara Neuffer, Klaus Mummenhoff (1997): Hybridization and evolution in Cardamine {Brassicaceae) at Urnerboden, Central Switzerland: biosystematic and molecular evidence – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 204: 233 - 256.