@article{10_4064_cm_66_2_227_242,
     author = {Jacek Dziuba\'nski and Jacek Zienkiewicz},
     title = {Smoothness of densities of semigroups of measures on homogeneous groups},
     journal = {Colloquium Mathematicum},
     pages = {227--242},
     publisher = {mathdoc},
     volume = {66},
     number = {2},
     year = {1993},
     doi = {10.4064/cm-66-2-227-242},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-66-2-227-242/}
}