@article{MM2_1984__47_155012,
     author = {Sin-ei Takahasi},
     title = {Remarks on quasicentral approximate identities.},
     journal = {Manuscripta mathematica},
     pages = {229--232},
     publisher = {mathdoc},
     volume = {47},
     year = {1984},
     zbl = {0548.46038},
     url = {http://geodesic.mathdoc.fr/item/MM2_1984__47_155012/}
}