@article{IM2_1993_41_2_a10,
     author = {I. M. Prudnikov},
     title = {Necessary and sufficient conditions for the representability of a positive homogeneous function of three variables in the form of a difference of convex functions},
     journal = {Izvestiya. Mathematics},
     pages = {377--387},
     year = {1993},
     volume = {41},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1993_41_2_a10/}
}