@article{TMF_2008_154_2_a11,
     author = {A. A. Bagaev},
     title = {Two-loop calculations of the~matrix $\sigma$-model effective action in
},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {354--362},
     publisher = {mathdoc},
     volume = {154},
     number = {2},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2008_154_2_a11/}
}