H. U. Keller; C. Arpigny; C. Barbieri; R. M. Bonnet; S. Cazes; M. Coradini; C. B. Cosmovici; W. A. Delamere; et al. (15 May 1986). "First Halley Multicolour Camera imaging results from Giotto". Nature. 321 (6067): 320–326. Bibcode:1986Natur.321..320K. doi:10.1038/321320a0. S2CID120631677.
W. Curdt; K. Wilhelm; A. Craubner; E. Krahn; H. U. Keller (February 1988). "Position of comet 1P/Halley at the Giotto encounter". Astronomy and Astrophysics. 191 (1): L1–L3. Bibcode:1988A&A...191L...1C. ISSN0004-6361.
H. U. Keller; C. Arpigny; C. Barbieri; R. M. Bonnet; S. Cazes; M. Coradini; C. B. Cosmovici; W. A. Delamere; et al. (15 May 1986). "First Halley Multicolour Camera imaging results from Giotto". Nature. 321 (6067): 320–326. Bibcode:1986Natur.321..320K. doi:10.1038/321320a0. S2CID120631677.
H. U. Keller; C. Arpigny; C. Barbieri; R. M. Bonnet; S. Cazes; M. Coradini; C. B. Cosmovici; W. A. Delamere; et al. (15 May 1986). "First Halley Multicolour Camera imaging results from Giotto". Nature. 321 (6067): 320–326. Bibcode:1986Natur.321..320K. doi:10.1038/321320a0. S2CID120631677.
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W. Curdt; K. Wilhelm; A. Craubner; E. Krahn; H. U. Keller (February 1988). "Position of comet 1P/Halley at the Giotto encounter". Astronomy and Astrophysics. 191 (1): L1–L3. Bibcode:1988A&A...191L...1C. ISSN0004-6361.