@article{MM2_1990__69_1_155547,
     author = {Miguel Ganz\'alez and J. Otal and J.M. Pena},
     title = {CC-Groups with periodic central factor.},
     journal = {Manuscripta mathematica},
     pages = {93--106},
     publisher = {mathdoc},
     volume = {69},
     number = {1},
     year = {1990},
     zbl = {0706.20028},
     url = {http://geodesic.mathdoc.fr/item/MM2_1990__69_1_155547/}
}