[1] D. L. Fried, J. Opt. Soc. Am. 55, 1427 (1965).
[2] M. C. Roggenmann and C. L. Matson, J. Opt. Soc. Am. A 9, 1525 (1992).
[3] M. C. Roggenmann, Appl. Opt. 30, 4227 (1991).
[4] G. Demoment, IEEE Trans. Acoustics, Speech, and Signal Processing 37, 2024 (1989).
[5] R. G. Lane, J. Opt. Am. A 13, 1992 (1996).
[6] T. J. Holmes and Y.-H. Liu, J. Opt. Soc. Am. A 8, 893 (1991).
[7] D. S. C. Biggs and M. Andrews, Appl. Opt. 36, 1766 (1997).