Wolanin, M. and Woźniak, M. 2012. Oenothera oehlkersii Kappus ex Rostański - a new evening-primrose species in Polish flora. Biodiversity: Research and Conservation. 23, (Feb. 2012), 57–58. DOI:https://doi.org/10.2478/v10119-011-0015-9.