http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
τ.1. In mathematical circles : quadrants I, II, III, ΙV - xxi, 145 σ. - 2003 -- τ.2. Mathematical circles revisited & Mathematical circles squared - xxiv, 196 σ. - 2003 -- τ.3. Mathematical circles adieu & Return to mathematical circles - xxiv, 186 σ. - 2003.