Bledsoe, W. W.; Browning, I. Pattern recognition and reading by machine. Papers presented at the December 1-3, 1959, eastern joint IRE-AIEE-ACM computer conference on - IRE-AIEE-ACM '59 (Eastern) (Boston, Massachusetts: ACM Press). 1959: 225–232. doi:10.1145/1460299.1460326(英语).
Bledsoe, W. W.; Browning, I. Pattern recognition and reading by machine. Papers presented at the December 1-3, 1959, eastern joint IRE-AIEE-ACM computer conference on - IRE-AIEE-ACM '59 (Eastern) (Boston, Massachusetts: ACM Press). 1959: 225–232. doi:10.1145/1460299.1460326(英语).