Oscillation of fixed points of solutions of some linear differential equations. Belaïdi, B. — 2008 Acta Mathematica Universitatis Comenianae. New Series
Iterated order of solutions of linear differential equations with entire coefficients. Hamani, K.; Belaidi, B. — 2010 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
On oscillation theorems for differential polynomials. El Farissi, A.; Belaidi, B. — 2009 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]