@article{TMF_1987_71_2_a5,
     author = {S. V. Ketov and B. B. Lokhvitskii and I. V. Tyutin},
     title = {Hyper--K\"ahler sigma models in extended superspace},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {226--237},
     publisher = {mathdoc},
     volume = {71},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_71_2_a5/}
}