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Author: 
			Leandro A. Sphaier			 
				 
			ISBN: 858792211 (Paperback) 
				 
			Publisher: E-papers Servicos Editoriais 
				 
			Year: 2001 
			Author: 
			Gustavo N. Rubiano O.			 
				 
			ISBN: 9789587192087 (Hardcover) 
				 
			Publisher: Universidad Nacional de Colombia 
				 
			Year: 2009 
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