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On the theory of boundary value problems for symmetrizable first-order systems. (Zur Theorie der Randwertprobleme für symmetrisierbare Systeme erster Ordnung.) (Russian) Zbl 0162.40802
Math. USSR, Sb. 2(1967), 143–171 (1968); translation from Mat. Sb., N. Ser. 73(115), 161-197 (1967).

MSC:
35F60 Boundary value problems for systems of nonlinear first-order PDEs
35D30 Weak solutions to PDEs
35D40 Viscosity solutions to PDEs
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