@incollection{Xu2013,
  author    = {Liejiong Xu},
  title     = {The topic-prominence parameter},
  booktitle = {Issues on topics / Ed. by Kerstin Schwabe ..., Zentrum f{\"u}r Allgemeine Sprachwissenschaft, Sprachtypologie und Universalienforschung, Berlin, 2000; ZAS papers in linguistics Vol. 20},
  volume    = {20},
  url       = {http://www.zas.gwz-berlin.de/fileadmin/material/ZASPiL_Volltexte/zp20/zaspil20-xu.pdf},
  year      = {2013},
}