The following resources for Tania function are loaded:
http://mizugadro.mydns.jp/t/index.php/Tania_function (Original desctiption)
http://en.citizendium.org/wiki/Tania_function (popular description)
Sorry, the previously announced article
http://tori.ils.uec.ac.jp/TORI/index.php/Tania_function is no more avialable.

http://link.springer.com/article/10.1007/s10043-013-0058-6 D.Kouznetsov. Superfunctions for amplifiers. Optical Review, July 2013, Volume 20, Issue 4, pp 321-326.