@article{VUU_2010_2_a2,
     author = {A. G. Chentsov},
     title = {To the question about precise and approximate validity in abstract control problem},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {29--48},
     publisher = {mathdoc},
     number = {2},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2010_2_a2/}
}