@article{IM2_1967_1_5_a0,
     author = {L. N. Shevrin},
     title = {Half-isomorphisms of cancellative semigroups},
     journal = {Izvestiya. Mathematics },
     pages = {915--921},
     publisher = {mathdoc},
     volume = {1},
     number = {5},
     year = {1967},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1967_1_5_a0/}
}