dispersion relations. Hermann. 1961. Marvin L. Goldberger & Kenneth M. Watson. Collision Theory. Dover. 2004. ISBN 0-486-43507-5. (corrected version of book
ISBN 1-55521-394-4 Hooper, David and Whyld, Kenneth, The Oxford Companion to Chess, Oxford University Press, 1984 Whyld, Kenneth, (Guinness) Chess; The Records,