http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Translated and adapted from the 1st Russian ed. (1959) by Jerome Kristian and Daniel A. Levin. Simplest maxima and minima problems / I.P. Natanson; translated and adapted from the 3rd Russian ed. (1960) by C. Clark Kissinger and Robert B. Brown.
"Survey of recent East European mathematical literature. A project conducted by Alfred L. Putnam and Izaak Wirszup."
Prosteĭshie zadachi na maksimum i minimum. English