2 literature references:

Author: Baruš, V. and O. Oliva (eds.)
Year: 1995
Title: Mihulovci a ryby. Fauna R a SR. (Cyclostomata and fishes. Fauna of Czech Republic and Slovakia).
Source: sv. 28 Academia Praha.
Author: Hanel, L.
Year: 2003
Title: Komentovaný prehled mihulí a ryb ceské republiky.
Source: Bull. Lampetra V: 27-67.