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*{{cite book|author=Daniel Zwillinger|title=Handbook of Differential Equations|url=https://books.google.com/?id=n7TiBQAAQBAJ&printsec=frontcover&dq=%22Handbook+of+Differential+Equations%22#v=onepage&q=%22Handbook%20of%20Differential%20Equations%22&f=false|date=12 May 2014|publisher=Elsevier Science|isbn=978-1-4832-6396-0}}
 
*{{cite book|author=Daniel Zwillinger|title=Handbook of Differential Equations|url=https://books.google.com/?id=n7TiBQAAQBAJ&printsec=frontcover&dq=%22Handbook+of+Differential+Equations%22#v=onepage&q=%22Handbook%20of%20Differential%20Equations%22&f=false|date=12 May 2014|publisher=Elsevier Science|isbn=978-1-4832-6396-0}}
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