TY - JOUR AU - Antonio Attalienti AU - Michele TI - Degenerate evolution problems and Beta-type operators JO - Studia Mathematica PY - 2000 SP - 117 EP - 139 VL - 140 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-140-2-117-139/ DO - 10.4064/sm-140-2-117-139 LA - en ID - 10_4064_sm_140_2_117_139 ER -