@article{MZM_1981_30_6_a8,
     author = {A. P. Ponomarev and N. Kh. Rozov},
     title = {Differentiability of the support function of {Pontryagin's} alternating integral},
     journal = {Matemati\v{c}eskie zametki},
     pages = {865--870},
     publisher = {mathdoc},
     volume = {30},
     number = {6},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_30_6_a8/}
}