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- [1] CHARACTERIZATION OF LINEAR PARTIAL DIFFERENTIAL OPERATORS OF HYPERBOLIC TYPE PROCEEDINGS OF THE JAPAN ACADEMY, 1973, 49 (07): : 506 - 509
- [6] SPECTRAL RESOLUTION OF DIFFERENTIAL OPERATORS ASSOCIATED WITH SYMMETRIC HYPERBOLIC SYSTEMS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1970, 17 (06): : 934 - &
- [7] HYBRIDS BETWEEN HYPERBOLIC AND ELLIPTIC DIFFERENTIAL OPERATORS WITH CONSTANT COEFFICIENTS ARKIV FOR MATEMATIK, 1975, 13 (02): : 209 - 235
- [8] DIFFERENTIAL INEQUALITIES FOR SEMILINEAR HYPERBOLIC OPERATORS WITH 2 INDEPENDENT VARIABLES NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (07): : 1055 - &