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The Free On-line Dictionary of Computing (foldoc)

Higher Order Logic. A proof-generating system for {higher
order logic} based on {LCF}. Implementations include {HOL-88}
and {HOL-90}.

{(ftp://ted.cs.uidaho.edu/pub/hol)}. Mailing list:
info-hol@ted.cs.uidaho.edu.

["HOL: A Machine Oriented Formulation of Higher Order Logic",
M.J.C. Gordon, Report 68, Comp Lab U Cambridge (1985)].

["Introduction to HOL", M.J.C. Gordon et al, Cambridge U Press
1993 ISBN 0-521-441897].