1. S.A. Avdonin, Simultaneous controllability of several elastic strings, inProc. CD of the Fourteenth International Symposium on Mathematical Theory of Networks and Systems. Perpignan, France, June 19-23 (2000).
2. S.A. Avdonin and S.A. Ivanov,Families of Exponentials. The Method of Moments in Controllability Problems for Distributed Parameter Systems. Cambridge University Press, New York (1995).
3. Généralisation d'un théorème de Beurling et application à la théorie du contrôle
4. J.W.S. Cassels,An Introduction to Diophantine Approximation. Cambridge University Press, Cambridge (1965).