Checklist of Baltic Sea macro-species - Arrendal, Johanna; Birzaks, Janis; Boedeker, Dieter; Brzeska, Paulina; Bučas, Martynas; Böttcher, Uwe; Chernova, Natalia; Dorrien, Christian von; Fedorov, Vladimir; Florin, Ann-Britt; Fricke, Ronald; Fürhaupter, Karin; et al. (Helsinki Commission, 2012)