Another Saaschützian theorem for double series
Rendiconti del Seminario Matematico della Università di Padova, Tome 34 (1964), pp. 200-203. 
@article{RSMUP_1964__34__200_0,
     author = {Carlitz, L.},
     title = {Another {Saasch\"utzian} theorem for double series},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {200--203},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {34},
     year = {1964},
     zbl = {0133.03203},
     mrnumber = {166407},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1964__34__200_0/}
}
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Carlitz, L. Another Saaschützian theorem for double series. Rendiconti del Seminario Matematico della Università di Padova, Tome 34 (1964), pp. 200-203. http://www.numdam.org/item/RSMUP_1964__34__200_0/

[1] Carlitz L.: A Saalschützian theorem for double series. Journal of the London Mathematical Society, Vol. 38 (1963), 415-418. | MR 160944 | Zbl 0129.28702