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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. 1944 The identity of weak and strong extensions of differential operators . Trans. Am. Math. Soc. 55:132-51. 1947 On the boundary-value problems of the theory of elasticity and Korn's inequality. Ann. Math. 48(2):267-97. 1948 On the perturbation of continuous spectra. Comm. Pure Appl. Math. I:361-406. With R. Courant. Supersonic Flow and Shock Waves. New York : Interscience. 1953 On the differentiability of the solutions of linear elliptic differential equations. Comm. Pure Appl. Math. VI:299-326. 1954 Symmetric hyperbolic differential equations. Comm. Pure Appl. Math. VII:354-92. 1955 Asymptotic phenomena in mathematical physics. Bull. Am. Math. Soc. 61(6):485-504. 1958 Symmetric positive linear differential equations. Comm. Pure Appl. Math. XI:333-418. 1981 Unobserved observables and unobserved causality. Comm. Pure Appl. Math. XXXIV:273-83. 1986 Kurt Otto Friedrichs, Selecta, vols. I and II , ed. C. S. Morawetz . Boston : Birkhauser.
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