@ARTICLE {2637,
author={P. Mateus and A. Sernadas and C. Sernadas},
doi={},
journal={Theoretical Computer Science},
title={Precategories for combining probabilistic automata - Early version presented at FIREworks Meeting, Magdeburg, May 15-16, 1998. Presented at CTCS'99, Edinburgh, September 10-12},
year={1999},
month={January},
volume={29},
number={-},
pages={---},
ISSN={0304-3975}
}