Anh, Nguyen Duc, and Petra Sierwald. “Distribution and Descriptive Characteristics of the Two Giant Pill Millipedes of the Genus <i> Sphaerobelum < I> Verhoeff, 1924 (Diplopoda, Sphaerotheriida, Zephroniidae) in Vietnam”. <i>Academia Journal of Biology</i> 41, no. 1 (March 28, 2019). Accessed November 6, 2025. https://cip.vast.vn/vjbio/article/view/11400.