TY  - JOUR
AU  - W. D.  Evans
AU  - D. J. Harris
AU  - J. Lang
TI  - Two-sided estimates for the approximation numbers of Hardy-type operators in $L^{∞}$ and L¹
JO  - Studia Mathematica
PY  - 1998
SP  - 171
EP  - 192
VL  - 130
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm_1998_130_2_1_171_192/
DO  - 10.4064/sm_1998_130_2_1_171_192
LA  - en
ID  - 10_4064_sm_1998_130_2_1_171_192
ER  -