Szymura, M., Szymura, T. H. and Kreitschitz, A. (2015) “Morphological and cytological diversity of goldenrods (Solidago L. and Euthamia Nutt.) from south-western Poland”, Biodiversity: Research and Conservation, 38, pp. 41–49. doi: 10.1515/biorc-2015-0010.