It is first recorded as being studied by R. L. Brooks, C. A. B. Smith, A. H. Stone, and W. T. Tutte, at Cambridge University, and the first perfect squared square was found by Roland Sprague in 1939.
It is first recorded as being studied by R. L. Brooks. This was at Cambridge University. It is first recorded as being studied by C. A. B. Smith. This was at Cambridge University. It is first recorded as being studied by A. H. Stone. This was at Cambridge University. It is first recorded as being studied by W. T. Tutte. This was at Cambridge University. The first perfect squared square was found by Roland Sprague in 1939.