reference to recover BICEP power spectrum

http://iopscience.iop.org/0004-637X/692/2/1247/pdf/0004-637X_692_2_1247.pdf
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2005MNRAS.360.1262B&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
http://arxiv.org/pdf/1403.3985.pdf

student t-distribution

http://math.stackexchange.com/questions/474733/derivation-of-the-density-function-of-student-t-distribution-from-this-big-integ