David L. Elliott. A controllability counterexample. IEEE Trans. Automat. Contr., 50(6):840-841, 2005. [doi]
@article{Elliott05, title = {A controllability counterexample}, author = {David L. Elliott}, year = {2005}, doi = {10.1109/TAC.2005.849223}, url = {http://dx.doi.org/10.1109/TAC.2005.849223}, researchr = {https://researchr.org/publication/Elliott05}, cites = {0}, citedby = {0}, journal = {IEEE Trans. Automat. Contr.}, volume = {50}, number = {6}, pages = {840-841}, }