0201142368Graham Ronald L               Concrete mathematics: a foundation for computer science     Knuth Donald Ervin            QA 39.2 .G7333 1991 SCAR      Mathematics                   Addison-Wesley,1991 
0201896834Knuth Donald Ervin            The art of computer programming - vol.1                                                   QA 76.5 .K57 1997X PASC 1     Computer algorithms           Addison-Wesley,c1997