@incollection{Hamann2013,
  author    = {Silke Hamann},
  title     = {Retroflexion and retraction revised},
  booktitle = {Papers on phonetics and phonology : The articulation, acoustics and perception of consonants, Zentrum f{\"u}r Allgemeine Sprachwissenschaft, Sprachtypologie und Universalienforschung, Berlin; ZAS papers in linguistics ; Vol. 28},
  volume    = {28},
  url       = {http://www.zas.gwz-berlin.de/fileadmin/material/ZASPiL_Volltexte/zp28/zaspil28-hamann.pdf},
  year      = {2013},
}