PDF) Viola chelmea and Viola jooi (Violaceae), new species for the flora of Serbia and their distribution in the Balkan Peninsula and the Carpathians | Pavle Cikovac and Gordana Tomovic - Academia.edu
Plants | Free Full-Text | A Revised Phylogenetic Classification for Viola (Violaceae)
Plants | Free Full-Text | A Revised Phylogenetic Classification for Viola (Violaceae)
List of Viola species - Wikipedia
Viola jooi "Violet Chamber of Flower Photo Gallery" (Internet Guide)
Viola jooi – TRANSYLVANIAN VIOLET | Hill Farm Nursery