1. E. M. Volkov, L. F. Nurullin, and E. E. Nikolskiy, Ros. Fiziol. Zhurn., 87, No. 9, 1153-1160 (2001).
2. O. F. David, Morphological and Physiological Basis of Locomotion in Annelids [in Russian], Leningrad (1990).
3. A. L. Zefirov, P. N. Grigoryev, A. M. Petrov, et al., Tsitologiya, 44, No. 12, 1163–1171 (2003).
4. A. L. Zefirov, F. M. Zakharov, R. D. Mukhametzyanov, and A. M. Petrov, Zhurn. Evolyuts. Fiziol. i Biokhim, 44, No. 6, 603–612 (2008).
5. W. J. Betz and G. C. Bewick, J. Physiol., 460, 287–309 (1993).