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L. Ahlfors, On quasi-conformal mappings, Journal d'Analyse Mathématique vol. 4 (1954) pp. 1-58.

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L. Bers, Univalent solutions of linear elliptic systems, Comm. Pure Appl. Math. vol. 6 (1953) pp. 513-526. MR 0058830 (15:431b)

[3]

-, Existence and uniqueness of a subsonic flow past a given profile, Ibid. vol. 6 (1954) 441-504. MR 0065334 (16:417a)

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L. Bers and L. Nirenberg, On a representation theorem for linear elliptic systems with discontinuous coefficients and its applications, Convegno Internazionale sulle Equazioni Derivate e Parziali, Agosto, 1954, pp. 111-140. MR 0076981 (17:974d)

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B. V. Boyarskii, Homeomorphic solutions of Beltrami systems, Doklady Akademii Nauk SSSR. vol. 102 (1955) pp. 661-664. MR 0071620 (17:157a)

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R. Caccioppoli, Fondamenti per una teoria generale delle funzioni pseudo-analitiche di una variabile complessa, Accademia Nazionale dei Lincei, Rend. vol. 13(1952) pp. 197-204 and pp. 321-351. MR 0056718 (15:117e)

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H. P. Calderón and A. Zygmund, On the existence of certain singular integrals, Acta Math. vol. 88 (1952) pp. 85-139. MR 0052553 (14:637f)

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R. S. Finn, On a problem of type, with application to elliptic partial differential equations, Journal of Rational Mechanics and Analysis vol. 3 (1954) pp. 789-799. MR 0067314 (16:708a)

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K. O. Friedrichs, The identity of weak and strong extensions of differential operators, Trans. Amer. Math. Soc. vol. 55 (1944) pp. 132-151. MR 0009701 (5:188b)

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H. Grötzsch, Ueber die Verzerrung bei schlichten nichtkonformen Abbildungen und über eine damit zusammenhängende Erweiterung des Picardschen Satzes, Leipzig-Berlin, vol. 80, 1928.

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-, Ueber die Verzerrung bei nichtkonformen schlichten Abbildungen mehrfach zusammenhängender Bereiche, Leipzig-Berlin, vol. 82, 1930.

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-, Ueber möglichst konforme Abbildungen von schlichten Bereichen, Leipzig-Berlin, vol. 84, 1932.

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M. A. Lavrent'ev, A general problem of the theory of quasi-conformal representation of plane regions, Rec. Math. (Mat. Sbornik) N.S. vol. 21 (1947) pp. 285-326. MR 0027342 (10:290g)

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-, A fundamental theorem of the theory of quasi-conformal mapping of plane regions, Izvestiya Akademii Nauk SSSR. vol. 12 (1948) pp. 513-554. MR 0034842 (11:650b)

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A. Mori, On quasi-conformality and pseudo-analyticity, Trans. Amer. Math. Soc. vol. 68 (1957) pp. 56-77. MR 0083024 (18:646c)

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C. B. Morrey, On the solution of quasilinear elliptic partial differential equations, Trans. Amer. Math. Soc. vol. 43 (1938) pp. 126-166.

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L. Nirenberg, On nonlinear elliptic partial differential equations and Hölder continuity, Comm. Pure Appl. Math. vol. 6 (1953) pp. 97-156. MR 0064986 (16:367c)

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A. Pfluger, Quasikonforme Abbildungen und logarithmische Kapazität, Ann. Inst. Fourier vol. 2 (1950) pp. 69-80. MR 0044640 (13:453f)

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S. L. Sobolev, Some applications of functional analysis to mathematical physics, Leningrad Univ., Leningrad, 1950 (Russian). MR 0052039 (14:565a)

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S. Stoïlow, Leçons sur les principes topologiques de la théorie des fonctions analytiques, Paris, Gauthier-Villars, 1938.

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K. Strebel, On the maximum dilation of quasi-conformal mappings, Bull. Amer. Math. Soc. vol. 63 (1955) p. 225.

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O. Teichmuller, Untersuchungen über konforme und quasikonforme Abbildungen, Deutsche Mathematik vol. 3 (1938) pp. 621-678.

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L. I. Volkoviskii, Investigation on the problem of type of a simply-connected Riemann surface, Moscow, Izdat. Akad. SSSR, 1950. (Akad. Nauk Trudy Matem. Inst. imeni V. A. Steklova, no. 34.)

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G. T. Whyburn, Introductory topological analysis, Lectures on Functions of a Complex Variable, Ann Arbor, The University of Michigan Press, 1955. MR 0070161 (16:1140c)