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- [1] ECKERLE KL, 1976, NBS913 TECHN NOT
- [2] Gibson KS, 1938, J OPT SOC AM, V28, P372, DOI 10.1364/JOSA.28.000372
- [3] GIBSON KS, 1941, J OPT SOC AM, V31, P462
- [4] KEEGAN HJ, 1944, J OPT SOC AM, V34, P770
- [6] MIELENZ KD, 1972, NBS729 TECHN NOT
- [7] VENABLE WH, 1979, NBS26066 SPEC PUBL