@article{TMF_2009_159_2_a6,
     author = {N. T. Yilmaz},
     title = {Algebraic integration of sigma-model field equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {266--282},
     publisher = {mathdoc},
     volume = {159},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2009_159_2_a6/}
}