Talk:c/numeric/math/asinh

Link to MathWorld
Some pages of math functions (asinh,acosh,atanh,erf,erfc,tgamma,lgamma) have a link to MathWorld, but most do not. What are your criteria for deciding to include a link to a page which is outside cppreference? Newatthis (talk) 03:10, 6 November 2014 (PST)