On the oscillatory nature of perturbed second order nonlinear differential equations with damping. Nápoles, Juan E. — 2002 Mathematica Pannonica
A note on the qualitative behaviour of some second order nonlinear differential equations. Nápoles V., Juan E. — 2002 Divulgaciones Matemáticas
A note on the asymptotic stability in the whole of non-autonomous systems. Nápoles Valdés, Juan E. — 1999 Revista Colombiana de Matemáticas
On the continuability of solutions of bidimensional systems. Juan E. Nápoles V. — 1996 Extracta Mathematicae