http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Calculus of variations and partial differential equations
proceedings of a conference held in Trento, Italy, June 16-21, 1986
S. Hildebrandt, D. Kinderlehrer, M. Miranda, eds.
Lecture notes in mathematics (Springer-Verlag) ; 1340