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2. W. J. Eckert, Punched card methods in scientific computation, Watson Computing Bureau, Columbia University, 1940.
3. R. Lorant, Digiting without sorting, Pointers, International Business Machines Corporation, Group 9, No. 461.
4. R. Lorant, Sum of products and squares by card cycle total transfer, Pointers, International Business Machines Corporation, Group 9, No. 478.