Roger W. Brockett, Elmer G. Gilbert. An addendum to volterra series and geometric control theory. Automatica, 12(6):635, 1976. [doi]
@article{BrockettG76, title = {An addendum to volterra series and geometric control theory}, author = {Roger W. Brockett and Elmer G. Gilbert}, year = {1976}, doi = {10.1016/0005-1098(76)90047-9}, url = {http://dx.doi.org/10.1016/0005-1098(76)90047-9}, researchr = {https://researchr.org/publication/BrockettG76}, cites = {0}, citedby = {0}, journal = {Automatica}, volume = {12}, number = {6}, pages = {635}, }