FishBase References for Nygren, A., P. Edlund, U. Hirsch and L.
Ahsgren, 1968

Ref. No. Title
29378 Cytological studies in perch (Perca fluviatilis L.), pike (Esox lucius L.), pike-perch (Lucioperca lucioperca L.), and ruft (Acerina cernua L.).
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