@article{701122,
     title = {On semigroups of operators generated by second order differential operators on Lie groups},
     booktitle = {Abstracta. 6th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1978},
     pages = {61-62},
     url = {http://dml.mathdoc.fr/item/701122}
}

Kisyński, Jan. On semigroups of operators generated by second order differential operators on Lie groups, dans Abstracta. 6th Winter School on Abstract Analysis, GDML_Books,  (1978), pp. 61-62. http://gdmltest.u-ga.fr/item/701122/