@article{01054257, title = {Noninclusion theorems for summability matrices.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {20}, year = {1997}, pages = {511-516}, doi = {10.1155/S0161171297000690}, zbl = {0886.40005}, language = {en}, url = {http://dml.mathdoc.fr/item/01054257} }
Fridy, J.A. Noninclusion theorems for summability matrices.. International Journal of Mathematics and Mathematical Sciences, Tome 20 (1997) pp. 511-516. doi : 10.1155/S0161171297000690. http://gdmltest.u-ga.fr/item/01054257/