http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
A Collection of Problems Suggested for the International Mathematical Olympiads: 1959β2004
by DuΕan DjukiΔ, Vladimir JankoviΔ, Ivan MatiΔ, Nikola PetroviΔ