@article{10_4153_CJM_2007_049_7,
     author = {Bj\"orn, Anders and Bj\"orn, Jana and Shanmugalingam, Nageswari},
     title = {Sobolev {Extensions} of {H\"older} {Continuous} and {Characteristic} {Functions} on {Metric} {Spaces}},
     journal = {Canadian journal of mathematics},
     pages = {1135--1153},
     year = {2007},
     volume = {59},
     number = {6},
     doi = {10.4153/CJM-2007-049-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2007-049-7/}
}