@article{10_4064_cm_64_2_215_231,
     author = {Jacek Dziuba\'nski},
     title = {On semigroups generated by subelliptic operators on homogeneous groups},
     journal = {Colloquium Mathematicum},
     pages = {215--231},
     publisher = {mathdoc},
     volume = {64},
     number = {2},
     year = {1993},
     doi = {10.4064/cm-64-2-215-231},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-64-2-215-231/}
}