@article{IM2_1971_5_1_a14,
     author = {N. V. Krylov},
     title = {Control of  {Markov} processes and $W$-spaces},
     journal = {Izvestiya. Mathematics },
     pages = {233--266},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_1_a14/}
}