@article {uvigo:someproperties, title = {Some properties of the matrix exponential}, journal = {IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing}, volume = {48}, number = {2}, year = {2001}, month = {February}, pages = {213{\textendash}215}, keywords = {exponential matrix, linear algebra}, author = {R. L{\'o}pez-Valcarce and Soura Dasgupta} }