homepages/64/9428,
Jean-Philippe Noël and Jean-Philippe Noel, Home Page, https://scholar.google.com/citations?user=yovZafoAAAAJ, University of Liège, Belgium
homepages/26/4182,
Douglas Walton and Douglas N. Walton and Doug Walton, Home Page, https://scholar.google.com/citations?user=iRzoJwcAAAAJ, University of Windsor
homepages/02/3333,
Stefan Evert, Home Page, https://scholar.google.com/citations?user=OTn4ZMAAAAAJ, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany