Nachychko, V. O., & Sosnovsky, Y. V. (2021).

Sorting out the muddle: taxonomy and nomenclature of Thymus ×porcii (Lamiaceae) and related nothotaxa, with comments on parent species delimitation

. Phytotaxa, 501(1), 119–139. https://doi.org/10.11646/phytotaxa.501.1.4