Mytnik-Ejsmont, J. and Rutkowski, P. (2006) “Taxonomic position of Zhukowskia Szlach., R. Gonzalez T. & Rutk. (Cyclopogoninae, Spirantheae, Orchidaceae)”, Biodiversity: Research and Conservation, (1-2), pp. 7–10. doi: 10.14746/biorc.2006.1-2.2.