@article{TMF_1993_95_1_a14,
     author = {A. N. Vasil'ev and A. S. Stepanenko},
     title = {A method of calculating the critical dimensions of composite operators in the massless nonlinear $\sigma$ model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {160--175},
     year = {1993},
     volume = {95},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1993_95_1_a14/}
}