|   | 
				
					
	
		  | 
	 
	
		| Paper: | 
		Evolutionary Changes in the Periods of Cepheids | 
	 
	
		| Volume: | 
		203, The Impact of Large-Scale Surveys on Pulsating Star Research, IAU Colloquium 176 | 
	 
	
		| Page: | 
		244 | 
	 
	
		| Authors: | 
		Berdnikov, L. N.; Ignatova, V. V. | 
	 
	
	
		| Abstract: | 
		Our analysis of O-C diagrams for 230 (mainly northern) Cepheids revealed that periods of 67 of them show evolutionary changes. New parabolic elements for these Cepheids are presented. | 
	 
	
		| 
			
			
		 | 
	 
	
		  | 
	 
 
					 
				 | 
				  |