TY - JOUR AU - Faierman, M. TI - On a Perturbation in a Two-Parameter Ordinary Differential Equation of the Second Order JO - Canadian mathematical bulletin PY - 1971 SP - 25 EP - 33 VL - 14 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-005-9/ DO - 10.4153/CMB-1971-005-9 ID - 10_4153_CMB_1971_005_9 ER -