@article{PPR80,
AUTHOR = {Paul, W.J. and Prauss, E. and Reischuk, R.},
TITLE = {On Alternation},
VOLUME = {14},
YEAR = {1980},
PAGES = {243--255},
URL = {http:///publikationen/PPR80.pdf},
SERIES = {Acta Informatica 1980},
EE = {http://www.springerlink.de/content/d6t6810300h2478p/},
}