TY - JOUR AU - Ĺ eda, Valter TI - Some classes of linear $n$th-order differential equations JO - Archivum mathematicum PY - 1997 SP - 157 EP - 165 VL - 33 IS - 1-2 UR - http://geodesic.mathdoc.fr/item/ARM_1997_33_1-2_a16/ LA - en ID - ARM_1997_33_1-2_a16 ER -