1. [1] M. Kawamata: On the invariance of the second-order modes of continuous-time systems under general frequency transformation, Proc. IEEE Int. Sympo. Circuits, Syst., pp. I-505-I-508, May 2003.
2. [2] S. Koshita, M. Abe, and M. Kawamata: Gramian-preserving frequency transformation for linear continuous-time state-space systems, Proc. IEEE Int. Sympo. Circuits, Syst., pp. 453-456, May 2006.
3. [3] B. T. Polyak and Y. Z. Tsypkin: Stability and robust stability of uniform system, Automation and Remote Control, Vol. 57, No. 11, pp. 1606-1617, 1996.
4. [4] J. A. Fax and R. M. Murray: Information flow and cooperative control of vehicle formations, IEEE Trans. Autom. Contr., Vol. 49, No. 9, pp. 1465-1476, 2004.
5. [5] A. Jadbabaie, J. Lin, and A. S. Morse: Coordination of groups of mobile autonomous agents using nearest neighbor rules, Physical Review Letters, Vol. 48, No. 6, pp. 988-1001, 2003.