TY  - CHAP
AU  - Llavona, José G.
PY  - 1982
UR  - https://hdl.handle.net/20.500.14352/65480
M2  - 387
PB  - Gauthier-Villars
TI  - On the density of polynomial subalgebras of weakly differentiable functions (Spanish)
TY  - book part
ER  -