TY - JOUR AU - Weikard, R. TI - On commuting differential operators JO - Electronic Journal of Differential Equations PY - 2000 VL - 2000 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a185/ LA - en ID - EJDE_2000__2000__a185 ER -