@article{SM_1985_50_1_a16,
     author = {N. M. Ivochkina},
     title = {A description of the stability cones generated by differential operators of {Monge--Amp\`ere} type},
     journal = {Sbornik. Mathematics},
     pages = {259--268},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1985_50_1_a16/}
}