@article{TMF_1998_116_3_a5,
     author = {S. \`E. Derkachev and A. N. Manashov},
     title = {Critical dimensions of composite operators in the nonlinear $\sigma$-model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {379--400},
     year = {1998},
     volume = {116},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1998_116_3_a5/}
}