src/pitch/pitchyin.h: add direct link to article

diff --git a/src/pitch/pitchyin.h b/src/pitch/pitchyin.h
index ad6b5a8..2b2a024 100644 (file)
--- a/src/pitch/pitchyin.h
+++ b/src/pitch/pitchyin.h
@@ -29,6 +29,7 @@
   estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930.
 
   see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
+      http://recherche.ircam.fr/equipes/pcm/cheveign/ps/2002_JASA_YIN_proof.pdf
 
   \example pitch/test-pitchyin.c