Tsar'kov Oleg Igorevich

Publications in Math-Net.Ru

1. Extension of endomorphisms of the subsemigroup $\mathrm{GE}^+_2(R)$ to endomorphisms of $\mathrm{GE}^+_2(R[x])$, where $R$ is a partially-ordered commutative ring without zero divisors
   
   Fundam. Prikl. Mat., 18:4 (2013),  155–184
2. Endomorphisms of the semigroup $G_2(R)$ over partially ordered commutative rings without zero divisors and with $1/2$
   
   Fundam. Prikl. Mat., 18:1 (2013),  181–204