@article{ARM_1972_8_4_a0,
     author = {Bajaj, Prem N.},
     title = {On products of semi-dynamical systems},
     journal = {Archivum mathematicum},
     pages = {157--160},
     year = {1972},
     volume = {8},
     number = {4},
     mrnumber = {0328893},
     zbl = {0284.54024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1972_8_4_a0/}
}