Korábek, O.; Hausdorf, B. (2023). Unravelling the double Helix escherichi, with description of Helix ankae sp. nov. and a discussion of Maltzanella and the subgenera of Helix (Gastropoda: Helicidae). Archiv für Molluskenkunde. 152(2): 239-256.
Unravelling the double <em><em>Helix </em>escherichi</em>, with description of <em><em>Helix </em>ankae</em> sp. nov. and a discussion of <em>Maltzanella </em>and the subgenera of <em>Helix </em>(Gastropoda: Helicidae)