http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
A. N. Kolmogorov, S. V. Fomin ; translated and edited by Richard A. Silverman.
Translation of Ėlementy teorii funkt︠s︡ii i funkt︠s︡ionalʹnogo analiza.