1. Anon. 2007. Management Plan for the Finnish Seal Populations in the Baltic Sea. Ministry of Agriculture and Forestry 4b/2007, Helsinki. 95 pp. ISBN 978–952-453–348-5, ISSN 1238–2531.
2. Anon. 2019. Nationell förvaltningsplan för gråsäl (Halichoerus grypus) i Östersjön. Havs- och vattenmyndighetens rapport (Swedish Agency for Marine and Water Management) 2019:24. 83 pp. (In Swedish).
3. Anon. 2022. Yearly info-releases by the Natural Resources Institute Finland. https://www.luke.fi/fi/seurannat/merihyljelaskennat-ja-hyljekannan-rakenteen-seuranta/harmaahyljekanta-2022.
4. Neither fish nor fowl: navigating motivations for fisheries participation and exit in Sweden;Arias-Schreiber;Soc. Nat. Resour.,2021
5. The Evolutionary Ecology of Animal Migration;Baker,1978