Reference

Barbara Neuffer, Elke Scholand, Herbert Hurka (2003): Flowering ecotypes of Capselia bursa-pastohs (L.) Medik. (Brassica- ceae) along a latitudinal transect from the Kola Peninsula (67° N) to Astrakhan (46° N) in Russia – Palmarum Hortus Francofortensis - Wissenschaftliche Berichte – 7_2003: 207.