http://www.mrob.com/pub/muency/successiverefinement.html
http://www.mrob.com/pub/muency/automaticdwelllimit.html
http://caml.inria.fr/pub/docs/manual-ocaml/manual032.html
http://www.mpfr.org/mpfr-current/mpfr.html
http://gmplib.org/manual/Integer-Functions.html
http://aleph0.clarku.edu/~djoyce/julia/altplane.html
