Szeląg, Z. (2018).

Hieracia balcanica XV. Taxonomic and nomenclatural notes on Hieracium pilosissimum and H. divaricatum, with remarks on the H. heldreichii aggregate (Asteraceae)

. Phytotaxa, 356(1), 81–90. https://doi.org/10.11646/phytotaxa.356.1.7