@article{CMUC_1999__40_4_a0,
     author = {Janowitz, Melvin F. and Powers, R. C. and Riedel, T.},
     title = {Primes, coprimes and multiplicative elements},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {607--615},
     publisher = {mathdoc},
     volume = {40},
     number = {4},
     year = {1999},
     mrnumber = {1756539},
     zbl = {1011.06009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1999__40_4_a0/}
}