Szeląg, Zbigniew. “Hieracium sourekii (Asteraceae), a New Species in the H. senescens Aggregate and the Discovery of H. subortum In the Sudetes, Poland”. Phytotaxa 696, no. 3 (April 3, 2025): 217–223. Accessed April 16, 2025. https://phytotaxa.mapress.com/pt/article/view/phytotaxa.696.3.2.