Computers and Intractability: A Guide to the Theory of NP-completeness
Michael R. Garey & David S. Johnson
Heard on the Street: Quantitative Questions From Wall Street ...
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A First Course in Mathematical Modeling
Frank R. Giordano & Maurice D. Weir & William P. Fox
Proofs: A Long-Form Mathematics Textbook
Jay Cummings
Information Retrieval: Implementing and Evaluating Search Engines
Stefan Buttcher & Charles L. A. Clarke & Gordon V. Cormack