@article{ITA_1978__12_4_369_0,
     author = {Book, Ronald V. and Greibach, Sheila A.},
     title = {The independence of certain operations on {semiAFLs}},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {369--385},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {4},
     year = {1978},
     mrnumber = {517636},
     zbl = {0388.68068},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1978__12_4_369_0/}
}