 Volume 12
							Issue 4
								
						 Volume 12
							Issue 4 
						IEEE/CAA Journal of Automatica Sinica
| Citation: | J. Qu, Z. Ji, J. Wang, and Y. Liu, “Necessary and sufficient conditions for controllability and essential controllability of directed circle and tree graphs,” IEEE/CAA J. Autom. Sinica, vol. 12, no. 4, pp. 694–704, Apr. 2025. doi: 10.1109/JAS.2024.124866 | 
 
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