@article{AUPO_1988_27_1_a5,
     author = {Krutsk\'y, Franti\v{s}ek},
     title = {Reducibility and correspondences of pure generalized grammars},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {63--84},
     year = {1988},
     volume = {27},
     number = {1},
     mrnumber = {1039884},
     zbl = {0691.68078},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1988_27_1_a5/}
}