Beginning partial differential equations 
O'Neil, Peter V. 
 - 3rd edition. 
 -  John Wiley & Sons, Inc.,  2014 
 - ix, 438 p. 
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<br/><br/><label>ISBN: </label>978-1-11862994-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Partial.
<br/><br/><label>Dewey Class. No.: </label>515.353 O5866 2014