Biological rhythms / 
edited by Vinod Kumar. 
 - Berlin :  Springer-Verlag,  c2002. 
 - xvi, 254 p. :  ill. (some col.) ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/>Biological clocks at the end of the 20th century / M. Menaker  
<br/><br/><label>ISBN: </label>8173193851 (hbk. ) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Circadian rhythms.<br/>Photoperiodism.<br/>Biological Clocks.