@Article{ mag08, author = { Magnani, Valentino }, title = { Blow-up estimates at horizontal points and applications }, journal = { J. Geom. Anal. }, year = { 2010 }, volume = { 20 }, number = { 3 }, pages = { 705–722 }, URL = { http://cvgmt.sns.it/paper/65/ }, note = { cvgmt preprint} }