Sai Zeng, Angran Xiao, et al.
CAD Computer Aided Design
We show that the nonemptiness problem for two-way automata with only one endmarker over unary alphabets is complete for nondeterministic logarithmic space. This should be contrasted with the corresponding problem for two-way automata with two endmarkers, which is known to be NP-complete. © 1990.
Sai Zeng, Angran Xiao, et al.
CAD Computer Aided Design
Thomas M. Cover
IEEE Trans. Inf. Theory
Ziyang Liu, Sivaramakrishnan Natarajan, et al.
VLDB
Minkyong Kim, Zhen Liu, et al.
INFOCOM 2008