@article{FPM_2013_18_1_a10,
     author = {O. I. Tsarkov},
     title = {Endomorphisms of the semigroup $G_2(R)$ over partially ordered commutative rings without zero divisors and with~$1/2$},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {181--204},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2013_18_1_a10/}
}