@article{MAN_1971__193_182730,
     author = {Nguyen Phuong C\'AC},
     title = {On {Two} {Classes} of {Mappings} on {Banach} {Sequenee} {Spaces.}},
     journal = {Mathematische Annalen},
     pages = {322--334},
     publisher = {mathdoc},
     volume = {193},
     year = {1971},
     zbl = {0207.42704},
     url = {http://geodesic.mathdoc.fr/item/MAN_1971__193_182730/}
}