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								Geoffrey Exoo
							
              						
 
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								Robert Jajcay
							
              						
 
									
			
																												
							
						
										
					
Abstract
					A $(k, g)$-cage is a $k$-regular graph of girth $g$ of minimum order. In this survey, we present the results of over 50 years of searches for cages. We present the important theorems, list all the known cages, compile tables of current record holders, and describe in some detail most of the relevant constructions.