Sagan Z., Felińska C., 1973. Studies on a new group feature of eel erythrocytes-An(a). Acta Ichthyol. Piscat. 3 (1): 119-124.
The authors showed that the bovine, pig and goat sera make a source of model agglutinins for determinations of a new group feature of eel erythrocytes An(a). The An(a) feature was found in 40.4% of eels out of 62 examined eel individuals from the Szwaderki Lake.