Chechik V A

Publications in Math-Net.Ru

1. Investigation of systems of ordinary differential equations with a singularity
   
   Tr. Mosk. Mat. Obs., 8 (1959),  155–198
2. Necessary and sufficient conditions of semistability of a limit cycle
   
   Uspekhi Mat. Nauk, 10:1(63) (1955),  183–187