@article{TRSPY_1972_128_a8,
     author = {V. A. Il'in},
     title = {The {Riesz} equisummability of expansions in eigenfunctions and in the $n$-dimensional {Fourier} integral},
     journal = {Informatics and Automation},
     pages = {151--162},
     publisher = {mathdoc},
     volume = {128},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1972_128_a8/}
}