@article{EJDE_2016__2016__a35,
     author = {Al-Salti,  Nasser and Kerbal,  Sebti},
     title = {Non-local elliptic systems on the {Heisenberg} group},
     journal = {Electronic journal of differential equations},
     year = {2016},
     volume = {2016},
     zbl = {1329.35325},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2016__2016__a35/}
}