I managed to find this http://www.madsci.org/posts/archives/dec96/840131722.Dv.r.html http://www.madsci.org/posts/archives/dec96/840131722.Dv.r.ht... but unfo

I managed to find this http://www.madsci.org/posts/archives/dec96/840131722.Dv.r.html http://www.madsci.org/posts/archives/dec96/840131722.Dv.r.ht... but unfortunately it also does not cite a source :)