Combinatorial mathematics and its applications; proceedings of a conference held at the Mathematical Institute, Oxford, from 7-10 July, 1969, edited by D. J. A. Welsh. Welsh, D. J. A., ed. University of Oxford. Mathematical Institute. Combinatorial analysis Congresses. QA164 .C64 511.6 21 WEC Organized by the Mathematical Institute, Oxford. Includes bibliographical references. London, New York, Academic Press, 1971. 1971. 1971 Text x, 364 p. eng