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References
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1Bolton, J. G., Clarke, M. E., and Ekeis, R. D., 1965.—Aust. J. Phys. 18, 627.Google Scholar
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2Bolton, J. G., and Ekers, J. A., 1966.—Aust. J. Phys. 19, 559.Google Scholar
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3Maltby, P., and Moffet, A. T., 1962.—Ap. J. Supp. No. 67, 7, 141.Google Scholar