Exponential stability for periodic evolution families of bounded linear operators. Buşe, C. — 2001 Rendiconti del Seminario Matematico
A new proof for a Rolewicz's type theorem: An evolution semigroup approach. Buşe, C.; Dragomir, S.S. — 2001 Electronic Journal of Differential Equations (EJDE) [electronic only]
Boundedness and exponential stability for periodic time dependent systems. Buse, C.; Zada, A. — 2009 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
On weighted Ostrowski type inequalities for operators and vector-valued functions. Barnett, N.S.; Buşe, C.; Cerone, P.; Dragomir, S.S. — 2002 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]