Barker, V. A. e. (1977). Sparse matrix techniques, Copenhagen 1976: Advanced course, held at the Technical University of Denmark, Copenhagen, August 9-12, 1976. Springer-Verlag.

Barker, V. A. ed. Sparse Matrix Techniques, Copenhagen 1976: Advanced Course, Held at the Technical University of Denmark, Copenhagen, August 9-12, 1976. Berlin ; New York: Springer-Verlag, 1977.

Barker, V. A. ed. Sparse Matrix Techniques, Copenhagen 1976: Advanced Course, Held at the Technical University of Denmark, Copenhagen, August 9-12, 1976. Springer-Verlag, 1977.