@article{AFM_2008_33_1_a9,
     author = {Tonia Ricciardi},
     title = {On planar {Beltrami} equations and {H\"older} regularity},
     journal = {Annales Fennici Mathematici},
     pages = {143--158},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_2008_33_1_a9/}
}