1 literature reference for Eudontomyzon gracilis (Kux, 1965):

Author: Renaud, C.B. and J. Holcík
Year: 1986
Title: Eudontomyzon danfordi Regan 1911.
Source: p. 146-164. In J. Holcík (ed.) The freshwater fishes of Europe. Petromyzontiformes. AULA-Verlag GmbH, Wiesbaden. 313 p.