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Schileyko, A. A. (2004). Treatise on Recent terrestrial pulmonate molluscs. Part 12. Bradybaenidae, Monadeniidae, Xanthonychidae, Epiphragmophoridae, Helmintoglyptidae, Elonidae, Humboldtianidae, Spincterochilidae, Cochlicellidae. Ruthenica. Supplement 2: 1627-1763. Moskva [November].