@article{RM_1979_34_3_a4,
     author = {A. V. Babin},
     title = {On the expression of a~solution of the equation $Au=h$ in terms of iterations of the unbounded operator $A$, and the weighted approximation of functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {195},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_3_a4/}
}