@article{MAN_1976__220_162810,
     author = {Jean Dazord},
     title = {Factoring {Operators} through c0 .},
     journal = {Mathematische Annalen},
     pages = {105--122},
     year = {1976},
     volume = {220},
     zbl = {0304.47026},
     url = {http://geodesic.mathdoc.fr/item/MAN_1976__220_162810/}
}