1. Squared rectangles;Tutte,1964
2. A Method for Finding Simple Perfect Squared Squarings;Wilson,1967
3. P. J. Federico, private communication; Squaring rectangles and squares. A historical review with annotated bibliography, Submitted to the congress on graph theory held in July 1978 on the occasion of the 60th anniversary of Professor Tutte, to be published.
4. Problem 7795 and solution;Wilcocks;Fairy Chess Rev.,1948
5. Electronic Computation of Squared Rectangles;Duijvestijn,1962