Mathematical Olympiad Challenges

by Andreescu, Titu, Gelca, Razvan
Published 2009

103 Trigonometry Problems : From the Training of the USA IMO Team

by Andreescu, Titu, Feng, Zuming
Published 2005

Geometric Problems on Maxima and Minima

by Andreescu, Titu, Mushkarov, Oleg, Stoyanov, Luchezar
Published 2006