Lanczos, Cornelius <br/><br/>
Linear differential operators 

 - New York  D. Van Nostrand  1961 
 - xvi,564p. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Differential Equations Linear<br/>Calculas Operational
<br/><br/><label>Dewey Class. No.: </label>515.724  / L17L