@article{RM_1978_33_3_a9,
     author = {M. P. Ershov},
     title = {On~the~problem of extending measures},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {151--152},
     publisher = {mathdoc},
     volume = {33},
     number = {3},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1978_33_3_a9/}
}