Geodesic
Hyper--K\"ahler sigma models in extended superspace
Teoretičeskaâ i matematičeskaâ fizika, Tome 71 (1987) no. 2, pp. 226-237

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Self-interacting theories for generalized tensor multiplets and relaxed hypermultiplet of matter are constructed in $N=2, \ d=4$ superspace. Explicit formulation of a large set of new two-dimensional $N=4$ sigma-models with the hyper-Kähler metrics is given. It is shown that ultra-violet divergences in these theories cancel in all orders of perturbation theory. 
@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/}
}
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S. V. Ketov; B. B. Lokhvitskii; I. V. Tyutin. Hyper--K\"ahler sigma models in extended superspace. Teoretičeskaâ i matematičeskaâ fizika, Tome 71 (1987) no. 2, pp. 226-237. http://geodesic.mathdoc.fr/item/TMF_1987_71_2_a5/