von Proschwitz, T. (2010). Three land-snail species new to the Norwegian fauna: Pupilla pratensis (Clessin, 1871), Vertigo ultimathule von Proschwitz, 2007 and Balea sarsii Philippi, 1847 [= B. heydeni von Maltzan, 1881]. Fauna Norvegica, 30, 13-19. https://doi.org/10.5324/fn.v30i0.628