@article{AL_2003_42_4_a1,
     author = {Yu. L. Ershov},
     title = {Necessary {Isomorphism} {Conditions} for {Rogers} {Semilattices} of {Finite} {Partially} {Ordered} {Sets}},
     journal = {Algebra i logika},
     pages = {413--421},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2003_42_4_a1/}
}