Schleicher, D. G. and Millis, R. L. and Thompson, D.T. at all. Periodic variations in the activity of Comet P/Halley during the 1985/1986 apparition // AJ. — 1990. — Т. 100 (sep). — С. 896-912. — Bibcode:1990AJ....100..896S. — DOI:10.1086/115570.(англ.)
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Schleicher, D. G. and Millis, R. L. and Thompson, D.T. at all. Periodic variations in the activity of Comet P/Halley during the 1985/1986 apparition // AJ. — 1990. — Т. 100 (sep). — С. 896-912. — Bibcode:1990AJ....100..896S. — DOI:10.1086/115570.(англ.)