@Article{ ambmirpal04, author = { Ambrosio, Luigi and Miranda Jr, Michele and Pallara, Diego }, title = { Special Functions of Bounded Variation in Doubling Metric Measure Spaces }, journal = { Quad. Mat. }, year = { 2004 }, volume = { 14 }, pages = { 1-45 }, URL = { http://cvgmt.sns.it/paper/1291/ }, note = { cvgmt preprint} }