Woźniak-Chodacka, M. (2020).

A revision of taxonomic relation between Oenothera royfraseri and O. turoviensis (sect. Oenothera, subsect. Oenothera; Onagraceae) based on multivariate analyses of morphological characters

. Phytotaxa, 435(2), 164–180. https://doi.org/10.11646/phytotaxa.435.2.4