1. Multipliers of C∗-algebras;Akemann;J. Funct. Anal.,1973
2. A C∗-algebra for which Ext(A) is not a group;Anderson;Ann. of Math.,1978
3. A note on essentially normal operators;Arveson,1974
4. Notes on extensions of C∗-algebras;Arveson;Duke Math. J.,1977
5. Global theory of elliptic operators;Atiyah,1969