@InProceedings{Der07,
author={S. Derisavi},
title={A Symbolic Algorithm for Optimal {Markov} Chain Lumping},
booktitle={Proc. 13th International Conference on Tools and Algorithms for the Construction and Analysis of Systems (TACAS'07)},
year={2007},

editor={O. Grumberg and M. Huth},
pages={139-154},
organization={},
publisher={Springer},
series={LNCS},
volume={4424},
address={},
month={},
note={},
key={}
}