TY - JOUR AU - Miguel de Guzmán TI - On the derivation and covering properties of a differentiation basis JO - Studia Mathematica PY - 1972 SP - 359 EP - 364 VL - 44 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-44-4-359-364/ DO - 10.4064/sm-44-4-359-364 LA - en ID - 10_4064_sm_44_4_359_364 ER -