@article{KYB_1975__11_6_a0,
     author = {Mezn{\'\i}k, Ivan},
     title = {On $G$-machines generating intersection and union of generable languages},
     journal = {Kybernetika},
     pages = {--397},
     publisher = {mathdoc},
     volume = {11},
     number = {6},
     year = {1975},
     mrnumber = {0400795},
     zbl = {0325.94040},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1975__11_6_a0/}
}