Ivanova, E. S., van Luc, P., & Spiridonov, S. E. (2012). Two new species of Siconema (Drilonematoidea: Ungellidae) parasitic in earthworms in Vietnam, and systematic relationships as inferred from ribosomal sequence data. Zootaxa, 3344(1), 47–59. https://doi.org/10.11646/zootaxa.3344.1.3