@article{MZ_1972__125_171700,
     author = {Constantine Georgakis},
     title = {Double {Fourier} {Series} with {Coefficients} {O} (n m) -1.},
     journal = {Mathematische Zeitschrift},
     pages = {184--186},
     publisher = {mathdoc},
     volume = {125},
     year = {1972},
     zbl = {0223.42021},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171700/}
}