@article{CRMATH_2017__355_4_439_0,
     author = {Le, Nam Q.},
     title = {On optimal {H\"older} regularity of solutions to the equation {\ensuremath{\Delta}\protect\emph{u}\,+\,\protect\emph{b}\,\ensuremath{\cdot}\,\ensuremath{\nabla}\protect\emph{u}\,=\,0} in two dimensions},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {439--446},
     publisher = {Elsevier},
     volume = {355},
     number = {4},
     year = {2017},
     doi = {10.1016/j.crma.2017.02.005},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2017.02.005/}
}