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A priori estimates and hypoelliptic operators with multiple characteristics. (English. Russian original) Zbl 0206.10403
Sov. Math., Dokl. 10, 849-853 (1969); translation from Dokl. Akad. Nauk SSSR 187, 274-277 (1969).

35B45 A priori estimates in context of PDEs
65H10 Numerical computation of solutions to systems of equations
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