VAGALINSKI, B.; BORISSOV, S.; BOBEVA, A.; CANCIANI, G.; ANTIĆ, D. Ž. The mostly cavernicolous millipede genus Stygiiulus Verhoeff, 1929, stat. nov.: taxonomy, distribution and phylogenetic relationships (Diplopoda, Julida, Julidae). European Journal of Taxonomy, v. 798, n. 1, p. 30-69, 28 Feb. 2022.