« Natural Earth Projection: Home » [archive du ], www.shadedrelief.com (consulté le ) : « It was originally designed in Flex Projector using graphical methods and now exists as a polynomial version. »
« Natural Earth Projection: Home » [archive du ], www.shadedrelief.com (consulté le ) : « It was originally designed in Flex Projector using graphical methods and now exists as a polynomial version. »