@inproceedings{HPV75,
AUTHOR = {Hopcroft, J.E. and Paul, W.J. and Valiant L.G.},
TITLE = {On Time Versus Space and Related Problems},
YEAR = {1975},
PAGES = {57--64},
URL = {http:///publikationen/HPV75.pdf},
BOOKTITLE = {Proc. 16th IEEE-FOCS 1975},
EE = {http://doi.ieeecomputersociety.org/10.1109/SFCS.1975.23},
}