@article{702415,
title = {Mollifying operators with variable step and their application to approximation by infinitely differentiable functions},
booktitle = {Nonlinear Analysis, Function Spaces and Applications},
series = {GDML\_Books},
publisher = {BSB B. G. Teubner Verlagsgesellschaft},
address = {Leipzig},
year = {1982},
pages = {5-37},
mrnumber = {MR684996},
zbl = {0536.46021},
url = {http://dml.mathdoc.fr/item/702415}
}
Burenkov, V. I. Mollifying operators with variable step and their application to approximation by infinitely differentiable functions, dans Nonlinear Analysis, Function Spaces and Applications, GDML_Books, (1982), pp. 5-37. http://gdmltest.u-ga.fr/item/702415/