Levitan, B. M. <br/><br/>
Almost periodic functions and differential equations / 
B. M. Levitan & V. V. Zhikov ; translated by L. W. Longdon 
 - Cambridge :  Cambridge University Press,  1982 
 - x,211 p. ;  24 cm. 
<br/><br/>Bibnliography : (p. 200-207 ) 
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<br/><br/><label>ISBN: </label>0521244072 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Almost periodic functions<br/>Differential equations