TY  - JOUR
AU  - Nourrigat, Jean
TI  - Closure of the set of pseudodifferential operators
JO  - Comptes Rendus. Mathématique
PY  - 2012
SP  - 355
EP  - 358
VL  - 350
IS  - 7-8
PB  - Elsevier
UR  - http://www.numdam.org/articles/10.1016/j.crma.2012.04.006/
DO  - 10.1016/j.crma.2012.04.006
LA  - en
ID  - CRMATH_2012__350_7-8_355_0
ER  -