Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1968_2_a7, author = {Nguyen Van Khue}, title = {Tests for unconditional convergence bases}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {68--74}, publisher = {mathdoc}, number = {2}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1968_2_a7/} }
Nguyen Van Khue. Tests for unconditional convergence bases. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1968), pp. 68-74. http://geodesic.mathdoc.fr/item/IVM_1968_2_a7/