@article{KYB_1979__15_4_a0,
     author = {Coardo\c{s}, Vasile},
     title = {Equations associated with a context-free grammar},
     journal = {Kybernetika},
     pages = {--260},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {1979},
     mrnumber = {551570},
     zbl = {0418.68065},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1979__15_4_a0/}
}