L.  Magnano, Heijerman, T., and Germann, C., ?On the species status of Otiorhynchus armadillo (Rossi, 1792) and Otiorhynchus salicicola Heyden, 1908 (Coleoptera, Curculionidae, Entimini)?, Mitteilungen der Schweizerischen Entomologischen Gesellschaft, vol. 81, pp. 155-163, 2008.

L.  Magnano, Heijerman, T., and Germann, C., ?On the species status of Otiorhynchus armadillo (Rossi, 1792) and Otiorhynchus salicicola Heyden, 1908 (Coleoptera, Curculionidae, Entimini)?, Mitteilungen der Schweizerischen Entomologischen Gesellschaft, vol. 81, pp. 155-163, 2008.

R.  Gosik and Sprick, P., ?Morphology and identification of the pupae of seven species of the genus Otiorhynchus Germar, 1822 (Coleoptera, Curculionidae, Otiorhynchini)?, Zootaxa, vol. 3483, pp. 39-57, 2012.