@book{515,
	author = {Aho, Alfred V. and Hopcroft, John E.,},
	title = {The design and analysis of computer algorithms /},
	publisher = {Pearson education,},
	year = {c1974[reprinted 2001]},
	series = {Addison-Wesley series in computer science and information processing},
	address = {Reading, Mass. ;}
}