@inproceedings{Pa82,
AUTHOR = {Paul, W.J.},
TITLE = {On-line Simulation of k+1 Tapes by k Tapes Requires Nonlinear Time},
YEAR = {1982},
PAGES = {53--56},
URL = {http:///publikationen/Pa82.pdf},
BOOKTITLE = {Proc. 23rd IEEE-FOCS},
EE = {http://doi.ieeecomputersociety.org/10.1109/SFCS.1982.81},
}