Olympiad Problems from all over the World 8th Grade Content vol.4 – D.M. Batinetu-Giurgiu, Marin Chirciu, Daniel Sitaru, Octavian Stroe, Neculai Stanciu The book contains 400 problems in algebra, number theory, combinatorics, and geometry, from all over the world. It is an excellent text for preparing mathematics competitions of all levels. That is why I strongly recommend this book for mathematics teachers and gifted students. Radu Gologan, President of the Romanian Mathematical Society