@article{RSM_2001__59_3_116730,
     author = {Bekkar, M.},
     title = {On a system of partial differential equations in {Heisenberg} space. {(Sur} un syst\`eme d'\'equations aux d'\'eriv\'ees partielles dans l'espace de {Heisenberg.)}},
     journal = {Rendiconti del seminario matematico},
     pages = {177--184},
     publisher = {mathdoc},
     volume = {59},
     number = {3},
     year = {2001},
     zbl = {1177.49058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RSM_2001__59_3_116730/}
}