1. On the reduction of a symmetric matrix to tridiagonal form;Aasen;BIT,1971
2. On computing bounds for the least singular value of a triangular matrix;Anderson;BIT,1975
3. Concepts and notations for concurrent programming;Andrews;Comput. Surv.,1983
4. Solving sparse linear systems with sparse backward error;Arioli,1989
5. A taxonomy for conjugate gradient methods;Ashby,1988