@article{DAN_1957_117_1_a1,
     author = {I. A. Bakhtin},
     title = {On a class of equations with positive operators},
     journal = {Doklady Akademii Nauk},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {117},
     number = {1},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_117_1_a1/}
}