D. Stec, W. Morek, P. Gąsiorek, Łukasz Kaczmarek, and Łukasz Michalczyk, “Determinants and taxonomic consequences of extreme egg shell variability in Ramazzottius subanomalus (Biserov, 1985) (Tardigrada)”, Zootaxa, vol. 4208, no. 2, pp. 176–188, Dec. 2016.