@inproceedings{PPR78,
AUTHOR = {Paul, W.J. and Prauss, E. and Reischuk, R.},
TITLE = {On Alternation},
YEAR = {1978},
PAGES = {113--122},
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URL = {http:///publikationen/PPR78.pdf},
BOOKTITLE = {Proc. 19th IEEE-FOCS},
EE = {http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4567969},
}