Controllability of Poisson Systems. - Petre Birtea; Mircea Puta; Tudor S. Ratiu (SIAM J. Control. Optim., 2004)

Controllability problems in the charged top dynamics. - Petre Birtea; Mircea Puta; Razvan M. Tudoran; Constantin Voicu (Syst. Control. Lett., 2007)