Pavlenko-Barysheva, Valery.
" The fruit ultrastructure of the species from sections Praealtina (Gremli) Schljak. and Echinina (Näeg. et Peter) Schljak of the genus Pilosella Vaill. in Crimean flora" <em>Modern Phytomorphology</em> [Online], Volume 6(1 April 2014)