TY  - JOUR
AU  - Winfried Sickel
TI  - Superposition of functions in Sobolev spaces of fractional order. A survey
JO  - Banach Center Publications
PY  - 1992
SP  - 481
EP  - 497
VL  - 27
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/-27-2-481-497/
DO  - 10.4064/-27-2-481-497
LA  - en
ID  - 10_4064__27_2_481_497
ER  -