@article{MZ_1972__128_171788,
     author = {Peter J. Duran},
     title = {Infinite {Matrices} and {Almost} {Convergence.}},
     journal = {Mathematische Zeitschrift},
     pages = {75--84},
     year = {1972},
     volume = {128},
     zbl = {0228.40005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__128_171788/}
}