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On the calculus of variations and sequentially weakly continuous maps. (English) Zbl 0348.49004
Ordin. part. Differ. Equat., Proc. 4th Conf., Dundee 1976, Lect. Notes Math. 564, 13-25 (1976).

49J20 Existence theories for optimal control problems involving partial differential equations
49J45 Methods involving semicontinuity and convergence; relaxation
35J55 Systems of elliptic equations, boundary value problems (MSC2000)