Well, I finally found a web article that goes into considerable detail
with the three equations. It took two other articles to get there. About
22 pages of reading. Interesting stuff. What I found that was more
interesting though was those three equations must be solve by iterating
over two other ones.

I think I mentioned my interest started with a 1978 professionally
published paper that included the three. There was no mention of the
extra two equations. I guess the publication expected everyone to know
about them. The author only hints at what's going on by saying the three
must be solved. Ho, ho. Here's the link for the first, change the last 3
to 1 and 2 to get the first two. http://celestrak.com/columns/v02n03/