Mihalte, L., R. Sestras, and G. Feszt. “Morphological Characterization and Phylogenetic Distance Among Several Genotypes of <i>Rebutia, Aylostera, Mediolobivia</i> and <i>Sulcorebutia</I> (Cactaceae)”. African Journal of Biotechnology, vol. 10, no. 61, Nov. 2013, pp. 13051-7, doi:10.4314/ajb.v10i61.