@article{TRSPY_1987_180_a98,
     author = {Yu. L. Nosenko},
     title = {Sufficient conditions for integrability of double trigonometric cosine series},
     journal = {Informatics and Automation},
     pages = {166--168},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a98/}
}