Floquet operators without absolutely continuous spectrum G. Nenciu — 1993 Annales de l'I.H.P. Physique théorique
Adiabatic theory : stability of systems with increasing gaps G. Nenciu — 1997 Annales de l'I.H.P. Physique théorique
On the nonrelativistic limit of the Dirac hamiltonian D. R. Grigore; G. Nenciu; R. Purice — 1989 Annales de l'I.H.P. Physique théorique