Novák, Pavel, and Dominik Zukal. “Galium Divaricatum Pourr. Ex Lam. (Rubiaceae) – a New Species for the Flora of Ukraine”. Acta Botanica Croatica 77, no. 2 (October 1, 2018). Accessed January 28, 2022. http://www.abc.botanic.hr/index.php/abc/article/view/1953.