@article{IM2_1991_37_2_a1,
     author = {V. K. Zakharov},
     title = {Connections between the {Lebesgue} extension and the {Borel} extension of the first class, and between the preimages corresponding to them},
     journal = {Izvestiya. Mathematics },
     pages = {273--302},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_37_2_a1/}
}