@article{DAN_1973_209_3_a4,
     author = {M. G. Krein and P. Ya. Nudel'man},
     title = {On some new problems for {Hardy} class functions and continuous families of functions with double orthogonality},
     journal = {Doklady Akademii Nauk},
     pages = {537--540},
     publisher = {mathdoc},
     volume = {209},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_3_a4/}
}