Balakhnin I A, Gun'kovskiĭ S A, Kosolap M M
Parazitologiia. 1993 Mar-Apr;27(2):140-7.
The abundance and the distribution of Dactylogyrus extensus and Ichthyophthirius multifiliis on gills of two-years old carps have been investigated. It has been established that at least there are five groups, which differs from each other on the asymmetry of infection.