Calculus of variations and nonlinear partial differential equations : lectures given at the C.I.M.E. Summer School held in Cetraro, Italy, June 27-July 2, 2005 / Luigi Ambrosio ... [et al.] ; with a historical overview by Elvira Mascolo ; editors, Bernard Dacorogna, Paolo Marcellini / Luigi Ambrosio, Bernard Dacorogna, Paolo Marcellini, ほか