@article{RM_2001_56_3_a12,
     author = {M. Polyak},
     title = {Generalized {Crofton} formulae},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {589--591},
     publisher = {mathdoc},
     volume = {56},
     number = {3},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2001_56_3_a12/}
}