@article{RM_1984_39_2_a4,
     author = {A. V. Arutyunov and N. T. Tynyanskii},
     title = {The fixed sign property of quadratic forms on a cone},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {139--140},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1984_39_2_a4/}
}