Geodesic
Representation of periodic analytic functions by a sum of squares
Doklady Akademii Nauk, Tome 165 (1965) no. 1, pp. 40-43.

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     author = {S. L. Sobolev},
     title = {Representation of periodic analytic functions by a sum of squares},
     journal = {Doklady Akademii Nauk},
     pages = {40--43},
     publisher = {mathdoc},
     volume = {165},
     number = {1},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_1_a10/}
}
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S. L. Sobolev. Representation of periodic analytic functions by a sum of squares. Doklady Akademii Nauk, Tome 165 (1965) no. 1, pp. 40-43. http://geodesic.mathdoc.fr/item/DAN_1965_165_1_a10/