@article{PIM_1987_N_S_42_56_a7,
     author = {Z.U. Ahmad and Mursaleen  },
     title = {K\"othe-Toeplitz {Duals} of some new {Sequence} {Spaces} and {Their} {Matrix} {Maps}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {57 },
     publisher = {mathdoc},
     volume = {_N_S_42},
     number = {56},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1987_N_S_42_56_a7/}
}