Hæggström, Carl-Adam. 2019. “The Hawthorn Moth Scythropia Crataegella (Lepidoptera: Yponomeutidae) in Mariehamn, Åland Islands, in 2010–2018”. Memoranda Societatis Pro Fauna Et Flora Fennica 95 (December):113–121. https://journal.fi/msff/article/view/88154.