finding worst cases: http://perso.ens-lyon.fr/damien.stehle/DECIMALEXP.html
finding worst cases: http://www.loria.fr/equipes/spaces/slz.en.html
finding worst cases: http://perso.ens-lyon.fr/jean-michel.muller/Intro-to-TMD.htm
+generating libm functions: http://lipforge.ens-lyon.fr/www/metalibm/
fast conversion to fixedpoint: http://stereopsis.com/sree/fpu2006.html
double-double, quad-double arithmetics: http://crd-legacy.lbl.gov/~dhbailey/mpdist/
papers by kahan: http://www.cs.berkeley.edu/~wkahan/
fp paper by goldberg: http://download.oracle.com/docs/cd/E19957-01/806-3568/ncg_goldberg.html
+math functions in general: http://dlmf.nist.gov/