@article{ITA_1991__25_6_545_0,
     author = {Buntrock, G. and Drewes, F. and Lautemann, C. and Mossakowski, T.},
     title = {Some modifications of auxiliary pushdown automata},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {545--556},
     publisher = {EDP-Sciences},
     volume = {25},
     number = {6},
     year = {1991},
     mrnumber = {1145427},
     zbl = {0705.68051},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1991__25_6_545_0/}
}