CREDITS.

.classic methods for arcs and length of ellipse.
Credit is given to GNU, to GSL team, and in particular to Gerard Jungman who developed the Elliptic Integral functions of the free software library: GNU GSL Scientific Library. Computing the arcs of Ellipse through Elliptic Integrals allows an objective comparison with the results of inverse functions of mathconic.
Credit is given to Gérard P. Michon of Numericana, who gives on the Internet detailed information about classic exact methods for computing the circumpherence of an Ellipse.
Computing the circumpherence of an Ellipse through those classic methods allows an objective comparison with the results of inverse functions of mathconic.
Michon gives in the above Web Location a QBASIC code for computing the Ellipse's length by Gauss-Kummer's method and Cayley's method; We used logically equivalent C source routines for comparison in demo programs of mathconic.

.for cgi-lib.pl.
Credit is given to Steven E. Brenner for his Perl language library: cgi-lib.pl.
The cgi-lib.pl is used by the server-side scripts of this Web Location, in a version slightly modified to include style information in the generated Html output.