@article{TM_2013_280_a1,
     author = {A. S. Belov},
     title = {On positive definite piecewise linear functions and their applications},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {11--40},
     year = {2013},
     volume = {280},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2013_280_a1/}
}