homepages/54/9799,
Peter M. Landwehr, Home Page, https://scholar.google.com/citations?user=_Ly7WVcAAAAJ, Carnegie Mellon University, Institute for Software Research, Pittsburgh, PA, USA
homepages/53/4712,
Wanquan Liu and Wan Quan Liu, Home Page, http://orcid.org/0000-0003-4910-353X, Department of Mathematics, The University of Western Australia, Nedlands, WA, Australia