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  • .... Conversely, books are published with several ISBNs: A ''German'', second-language edition of ''[[Emil und die Detektive]]'' has the ISBNs 87-23-90157-8 ([[De ...t the same check digit every time. Finding publisher codes for English and German, say, with this effect amounts to solving a linear equation in modular arit
    33 KB (4,545 words) - 12:17, 21 January 2013