*''Error-Correcting Method and Apparatus G. Solomon, J.J. Stiffler, T. O. Anderson, W. Lushbaugh. U.S. Patent No. 3,373,404. March 12, 1968 | *''Error-Correcting Method and Apparatus G. Solomon, J.J. Stiffler, T. O. Anderson, W. Lushbaugh. U.S. Patent No. 3,373,404. March 12, 1968 |