[dredmorbius]

The inimitable comp.risks discussed this in 1992:

http://catless.ncl.ac.uk/Risks/13/35#subj1.1

http://catless.ncl.ac.uk/Risks/13/76#subj8.1

And in 1997:

http://catless.ncl.ac.uk/Risks/18/79#subj9.1