The onsets of disconnection events of comet P/Halley on 1985 December 13-14 and 1986 February 22M. R. Voelzke and O. T. MatsuuraAstron. Astrophys. Suppl. Ser., 146 1 (2000) 1-5DOI: https://doi.org/10.1051/aas:2000259