Dušan Djukić, Vladimir Janković, Ivan Matić, Nikola Petrović
The IMO Compendium - 2006 - Springer New York 2006 - Problem Books in Mathematics .
9780387334301
Mathematics and Statistics
The IMO Compendium - 2006 - Springer New York 2006 - Problem Books in Mathematics .
9780387334301
Mathematics and Statistics