TY - JOUR AU - Ferdinand Beckhoff TI - Korovkin theory in normed algebras JO - Studia Mathematica PY - 1991 SP - 219 EP - 228 VL - 100 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-100-3-219-228/ DO - 10.4064/sm-100-3-219-228 LA - en ID - 10_4064_sm_100_3_219_228 ER -