@article{DAN_1990_311_1_a2,
     author = {I. N. Dovzhenko and \`E. R. Tsekanovskii},
     title = {Classes of {Stieltjes} operator functions and their conservative},
     journal = {Doklady Akademii Nauk},
     pages = {18--22},
     publisher = {mathdoc},
     volume = {311},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a2/}
}