@article{10_4064_sm145_2_4,
     author = {T. Godoy and L. Saal},
     title = {On the relative fundamental solutions for a second order
differential operator on the {Heisenberg} group},
     journal = {Studia Mathematica},
     pages = {143--164},
     publisher = {mathdoc},
     volume = {145},
     number = {2},
     year = {2001},
     doi = {10.4064/sm145-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm145-2-4/}
}