First moments of the truncated and absolute Student's variates
  While some of the enclosed already is a well-known derivation, and the remaining may have been obtained in earlier publications, this note computes the first two moments of a Student's variate truncated at zero and of an absolute (or folded) Student's variate. 
Christian P. Robert (Universite Paris-Dauphine, IUF, and CREST)
math.ST stat.TH