@article{ASNSP_1969_3_23_3_413_0,
     author = {Barbu, Viorel},
     title = {Differentiable distribution semi-groups},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {413--429},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 23},
     number = {3},
     year = {1969},
     mrnumber = {257807},
     zbl = {0182.46501},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1969_3_23_3_413_0/}
}