@ARTICLE {4159,
author={D. Qiu Qiu and H. Xing and F. Liu},
doi={10.1016/j.fss.2011.10.003},
journal={Fuzzy Sets and Systems},
title={Automata theory based on complete residuated lattice-valued logic: Pushdown automata},
year={2009},
month={January},
volume={160},
number={16},
pages={1125-1140},
ISSN={0165-0114}
}