@article{DAN_1958_119_2_a4,
     author = {G. Ts. Tumarkin and S. Ya. Khavinson},
     title = {Properties of extremum functions in extremum problems for certain classes of analytic functions with a weighed metric},
     journal = {Doklady Akademii Nauk},
     pages = {215--218},
     publisher = {mathdoc},
     volume = {119},
     number = {2},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_119_2_a4/}
}