@article{MZ_1956__65_169605,
     author = {Kiiti Morita and Hiroyuki Tachikawa},
     title = {Character  modules, submodules of a free module, and {quasi-Frobenius} rings.},
     journal = {Mathematische Zeitschrift},
     pages = {414--428},
     publisher = {mathdoc},
     volume = {65},
     year = {1956},
     zbl = {0075.24301},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__65_169605/}
}