@article{IVM_1959_3_a21,
     author = {\`E. \`E. Tamme and L. \'E. Kheinla},
     title = {An approximate solution of operator equations depending on a~parameter},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {229--232},
     publisher = {mathdoc},
     number = {3},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1959_3_a21/}
}