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![Cover for Gerhard Kristensson · Second Order Differential Equations: Special Functions and Their Classification (Pocketbok) [2010 edition] (2014)](https://imusic.b-cdn.net/images/item/original/777/9781493901777.jpg?gerhard-kristensson-2014-second-order-differential-equations-special-functions-and-their-classification-pocketbok&class=scaled&v=1520120286)
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