Verbatim text: Lack, H. W. and B. E. Leuenberger. 1979. Pollen and taxonomy of Urospermum (Asteraceae, Lactuceae). Pollen & Spores 21: 415–425.
Author: Lack, H.W., Leuenberger, B.E.
Year: 1979
Title: Pollen and taxonomy of Urospermum (Asteraceae, Lactuceae)
Journal: Pollen & Spores
Volume: 21
Pages: 415–425