Mr. Babbage's secret: the tale of a Cypher and APL: O. I. Franksen. Strandbergs Forlag, Denmark (1984). 320 pp. Dkr. 320.00. ISBN: 87-872-0086-4

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论文评审过程:Available online 13 July 2002.

论文官网地址:https://doi.org/10.1016/0306-4573(86)90018-X