Byerly, William Elwood,  b. 1849 <br/><br/>
Introduction to the calculus of variations / 
by William Elwood byerly 
 - Cambridge :  Harvard University Press,  1917 
 - 48 p. ;  22 cm. 
 - Mathematical tracts for physicists .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus of variations