@article{IM2_2003_67_1_a0,
     author = {V. I. Danilov and G. A. Koshevoy},
     title = {Nilpotent operators and discretely concave functions},
     journal = {Izvestiya. Mathematics},
     pages = {1--15},
     year = {2003},
     volume = {67},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2003_67_1_a0/}
}