TY - JOUR AU - Manfrin, Renato TI - A note on linear perturbations of oscillatory second order differential equations JO - Archivum mathematicum PY - 2010 SP - 105 EP - 118 VL - 46 IS - 2 UR - http://geodesic.mathdoc.fr/item/ARM_2010_46_2_a3/ LA - en ID - ARM_2010_46_2_a3 ER -