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http://www.zxdesign.info/book/bookAnnounce.shtml
or Michael Debenham's book:
https://books.google.co.uk/books?id=4LsgBQAAQBAJ&pg=PA51 <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/51.6.217.39|51.6.217.39]] ([[User talk:51.6.217.39#top|talk]]) 22:01, 18 May 2017 (UTC)</small> <!--Autosigned by SineBot-->
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