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Green, A. E. S., Cross, K. R. and Smith, Leonard A. (1980) Improved analytic characterization of ultraviolet skylight. Photochemistry and Photobiology, 31 (1). pp. 59-65. ISSN 0031-8655
Tong, Howell and Lim, K S (1980) Threshold autoregression, limit cycles and cyclical data- with discussion. Journal of the Royal Statistical Society. Series B: Statistical Methodology, 42 (3). pp. 245-292. ISSN 1369-7412