Devyatkin Leonid Yur'evich

Publications in Math-Net.Ru

1. The set of closed classes $P_{k+1}$ that can be homomorphically mapped on $P_k$ has the cardinality of continuum
   
   Vestnik Moskov. Univ. Ser. 1. Mat. Mekh., 2020, no. 1,  69–70