@article{JEMS_2013_15_2_a1,
     author = {Andrea Bonfiglioli and Ermanno Lanconelli},
     title = {Subharmonic functions in {sub-Riemannian} settings},
     journal = {Journal of the European Mathematical Society},
     pages = {387--441},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2013},
     doi = {10.4171/jems/364},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/364/}
}