About Place Of Mortification
http://www.sacred-texts.com/bud/btg/btg11.htm
About Uruvela
http://www.palikanon.com/english/pali_names/u/uruvelaa.htm
Dhammacakkappavattana Sutta
http://www.accesstoinsight.org/tipitaka/sn/sn56/sn56.011.than.html
There are these two extremes that are not to be indulged in by one who has
gone forth. Which two? That which is devoted to sensual pleasure with
reference to sensual objects: base, vulgar, common, ignoble, unprofitable;
and that which is devoted to self-affliction: painful, ignoble, unprofitable.
Avoiding both of these extremes, the middle way realized by the Tathagata
(http://www.accesstoinsight.org/tipitaka/sn/sn56/sn56.011.than.html)