1 literature reference:

Author: Heckman, C.W.
Year: 1991
Title: Alosa pontica kessleri (Grimm 1887).
Source: p. 325-336. In H. Hoestlandt (ed.) The freshwater fishes of Europe. Vol. 2. Clupeidae, Anguillidae. AULA-Verlag Wiesbaden.