Sikkema, Pieter Cornelis. <br/><br/>
Differential operators and differential equations of infinite order with constant coefficients;  researches in connection with integral f unctions of finite order / 
by  Pieter Cornelis Sikkema. 
 - Groningen :  P. Noordhoff ,  1953. 
 - 223 p. ;  25 cm. 
<br/><br/> Proefschrift--Groningen.  "Stellingen": 5 p. inserted. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.<br/>Integrals.
<br/><br/><label>Dewey Class. No.: </label>517.38 SIK