TY - JOUR AU - Lakrib, Mustapha AU - Kherraz, Tahar AU - Bourada, Amel TI - Averaging for ordinary differential equations perturbed by a small parameter JO - Mathematica Bohemica PY - 2016 SP - 143 EP - 151 VL - 141 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/MB.2016.12/ DO - 10.21136/MB.2016.12 LA - en ID - 10_21136_MB_2016_12 ER -