Reuter, G. E. H. (Gerd Edzard Harry) <br/><br/>
Elementary differential equations and operators. 

 - London :  Routledge & K. Paul,  [1966] 
<br/><br/> First published 1958. 
<br/><br/>Bibliographical footnotes. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.