[1] C T. Lin: Structural controllability. IEEE Trans. Automat. Control 19 (1974), 201 - 208. MR 0452870 | Zbl 0343.93009

[2] L. A. Trave A. Titli, A. Tarras: Large Scale Systems: Decentralization, Structure Constraints and Fixed Modes. Springer-Verlag, Berlin -Heidelberg-New York 1989. MR 0992403

[3] K. J. Reinschke: Algebraic formulation of arbitrary pole assignability by static output feedback. Internat. J. Control 46 (1987), 1947-1977. MR 0924265

[4] A. Şefik: Structural Analysis of Pole Assignment and Stabilization in Dynamic Systems. Ph. D. Thesis, Bilkent University, Ankara 1989.

[5] R. W. Shields, J. B. Pearson: Structural controllability of multi-input linear systems. IEEE Trans. Automat. Control 21 (1976), 203-212. MR 0462690

[6] F. Harary R. Z. Norman, D. Cartwright: Structural Models: An Introduction to the Theory of Directed Graphs. J. Wiley, New York 1965. MR 0184874

[7] K. J. Reinschke: Graph-theoretic characterization of fixed modes in centralized and decentralized control. Internat. J. Control 39 (1984), 715 - 729. MR 0738718 | Zbl 0537.93009

[8] E. J. Davison, R. Chatterjee: A note on pole assignment in linear systems with incomplete state feedback. IEEE Trans. Automat. Control 16 (1971), 98 - 99. MR 0289168

[9] M. E. Sezer, D. D. Šiljak: On structurally fixed modes. Proceedings of the IEEE Internat. Symp. on Circuits and Systems, Cnicago, Illinois 1981, pp. 558-565. MR 0667330

[10] V. Pichai M. E. Sezer, D. D. Šiljak: A graph-theoretic characterization of structurally fixed modes. Automatica 20 (1984), 247 - 250.

[11] F. M. Brasch, Jr., J. B. Pearson: Pole placement using dynamic compensation. IEEE Trans. Automat. Control 15 (1970), 34-43. MR 0274076

[12] H. Kimura: On pole assignment by output feedback. Internat. J. Control 28 (1978), 11 - 22. MR 0504100 | Zbl 0392.93025