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Harms, J., 1993. Check list of species (algae, invertebtates and vertebrates) found in the vicinity of the island of Helgoland (North Sea, German Bight) - a review of recent records. Helgoländer Meeresunters., 47: 1-34.

Seaward, D.R., 1990. Distribution of the marine molluscs of north west Europe. Nature Conservancy Council.

Thompson, T.E. & G.H. Brown, 1976/1984. Biology of Opisthobranch Molluscs, volume I and II. Ray Society. London.

Thompson, T.E., 1988. Molluscs: Benthic Opisthobranchs (Mollusca: Gastropoda). Synopses of the British fauna (NS), 8: 1-356.

Polycera dubia