Hatteland, Bjørn Arild, Steffen Roth, Arild Andersen, Kristin Kaasa, Bente Støa, and Torstein Solhøy. 2013. “Distribution and Spread of the Invasive Slug Arion Vulgaris Moquin-Tandon in Norway”. Fauna Norvegica 32 (February):13-26. https://doi.org/10.5324/fn.v32i0.1473.