1. [4] K. Diederich and J. E. Fornaess, Pseudoconvex domains with real-analytic boundary, Ann. Math. (2) 107 (1978), no. 2, 371–384.
2. [5] J. J. Kohn, Subellipticity of the $\bar \partial$-Neumann problem on pseudo-convex domains: sufficient conditions, Acta Math. 142 (1979), no. 1-2, 79–122.
3. [1] S. Bell and E. Ligocka, A simplification and extension of Fefferman's theorem on biholomorphic mappings, Invent. Math. 57 (1980), no. 3, 283–289.
4. [2] S. Bell, Biholomorphic mappings and the $\bar\partial$-problem, Ann. of Math. (in press, 1980).
5. [3] L. Bers, F. John, and M. Schechter, Partial differential equations, Lectures in Applied Math., vol. 3A, American Mathematical Society, Providence, R.I., 1979, Proceedings of the summer seminar, Boulder, Colorado, 1957.