@article{ASNSP_1998_4_27_3-4_499_0,
     author = {Weber, Frank},
     title = {On products of non-commuting sectorial operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {499--531},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 27},
     number = {3-4},
     year = {1998},
     mrnumber = {1677994},
     zbl = {0935.47028},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1998_4_27_3-4_499_0/}
}