@ARTICLE {2612,
author={C. Sernadas and J. Fiadeiro and A. Sernadas},
doi={},
journal={Information Systems},
title={Modular construction of logic knowledge bases: An algebraic approach},
year={1990},
month={January},
volume={15},
number={1},
pages={37-59},
ISSN={0306-4379}
}