This is another interesting article about using
Least Squares to close cave survey loops. It was titled "Simultaneous
Multiple Loop Closures For Cave Surveys: A Computer Program."
It was written by Neil I Smith and originally appeared in the
Proceedings of Australian Speleological Society in 1979. It was
reprinted the NSS Computer Applications Section newsletter in
December of 1982.
The article present concepts and the author
claims that his techniques are superior to other such as those
Schmidt and Schelleng. Since the Computer Application
Section is no longer active and the article is virtually impossible to find anywhere on the
internet, I've scanned my copy and posted it here: