@article{VMUMM_1984_1_a9,
     author = {V. V. Tikhomirov},
     title = {On the choice of the length of approximation interval in the estimation of a derivative in control problems},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {45--48},
     year = {1984},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1984_1_a9/}
}