TY  - JOUR
AU  - Matthew J. Gursky
AU  - Andrea Malchiodi
TI  - A strong maximum principle for the Paneitz operator and a non-local flow for the $Q$-curvature
JO  - Journal of the European Mathematical Society
PY  - 2015
SP  - 2137
EP  - 2173
VL  - 17
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4171/jems/553/
DO  - 10.4171/jems/553
ID  - JEMS_2015_17_9_a2
ER  -