Reference
Roland Kirschner, Martin Nebel, Theodor Butterfass (2010): Observations on fertile populations of Lunularia cruciata (L.)
Dumort. ex Lindb. (Marchantiopsida: Lunulariaceae) in Germany – Stuttgarter Beiträge Naturkunde Serie A [Biologie] – NS_3_A: 363 - 371.