A Simple Non-Euclidean Geometry and Its Physical Basis: An Elementary Account of Galilean Geometry and the Galilean Principle of Relativity

Lecture Notes on Graph Theory: Lecture Notes on Graph Theory

Complex Numbers in Geometry

MATHEMAICS FORMULAE

The USSR Olympiad Problem Book: Selected Problems and Theorems of Elementary Mathematics

Problems and Solutions for Integer and Combinatorial Optimization: Building Skills in Discrete Optimization

Proof and the Art of Mathematics

Combinatorial Optimization: Algorithms and Complexity

How to Guard an Art Gallery: And Other Discrete Mathematical Adventures

Numbers, Groups and Codes: Edition 2

Principles And Techniques In Combinatorics

PHP By Yusuf Khan: 115 Solved Problems on The Pigeon Hole Principle

100 Great Problems of Elementary Mathematics

P&C by Yusuf Khan: The FirstBook of COMBINATORICS

Chromatic Graph Theory

Combinatorial Pattern Matching Algorithms in Computational Biology Using Perl and R

Number Theory: Structures, Examples, and Problems