@article{TMF_1984_59_3_a12,
     author = {R. G. Ismagilov},
     title = {Light fermions and instantons in the $\sigma$ model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {465--471},
     year = {1984},
     volume = {59},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_59_3_a12/}
}