@article{DAN_1964_157_5_a7,
     author = {I. M. Milin},
     title = {Closed orthonormal systems of analytic functions in domains of finite connectivity},
     journal = {Doklady Akademii Nauk},
     pages = {1043--1046},
     publisher = {mathdoc},
     volume = {157},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_157_5_a7/}
}