Pavol Duris, Juraj Hromkovic. One-Way Simple Multihead Finite Automata are not Closed Under Concatenation. Theoretical Computer Science, 27:121-125, 1983.
@article{DurisH83,
title = {One-Way Simple Multihead Finite Automata are not Closed Under Concatenation},
author = {Pavol Duris and Juraj Hromkovic},
year = {1983},
researchr = {https://researchr.org/publication/DurisH83},
cites = {0},
citedby = {0},
journal = {Theoretical Computer Science},
volume = {27},
pages = {121-125},
}