@article{RMI_2007_2007_1_a6,
     author = {Juutinen, P. and  Lu, G. and  Manfredi, J. J. and  Stroffolini, B.},
     title = {Convex functions on {Carnot} groups.},
     journal = {Revista matem\'atica iberoamericana},
     pages = {191-200},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_2007_2007_1_a6/}
}