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  1. 1
    Chris Christensen, The National Cash Register Company Additive Recovery Machine, Cryptologia, 2014, 38, 2, 152

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  2. 2
    David Agard, Chris Christensen, Review ofThe Theory That Would Not Dieby Sharon McGrayne, Cryptologia, 2012, 36, 2, 183

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  3. 3
    Chris Christensen, Review ofThe Bletchley Park Codebreakersby Ralph Erskine and Michael Smith, Cryptologia, 2011, 35, 3, 293

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