@article{10_1090_jams_853,
     author = {Aptekarev, A. and Denisov, S. and Tulyakov, D.},
     title = {On a problem by {Steklov}},
     journal = {Journal of the American Mathematical Society},
     pages = {1117--1165},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {2016},
     doi = {10.1090/jams/853},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/jams/853/}
}