@article{JCA_2008_15_4_JCA_2008_15_4_a5,
     author = {A. Calogero and G. Carcano and R. Pini},
     title = {On {Weakly} {H-Quasiconvex} {Functions} on the {Heisenberg} {Group}},
     journal = {Journal of convex analysis},
     pages = {753--766},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/JCA_2008_15_4_JCA_2008_15_4_a5/}
}