TY  - JOUR
AU  - Tadeusz Kulczycki
TI  - On concavity of solutions of the Dirichlet problem for the equation $(-\Delta)^{1/2} \varphi = 1$ in convex planar regions
JO  - Journal of the European Mathematical Society
PY  - 2017
SP  - 1361
EP  - 1420
VL  - 19
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4171/jems/695/
DO  - 10.4171/jems/695
ID  - JEMS_2017_19_5_a2
ER  -