homepages/78/3834-5,
Andreas Schäfer, Home Page, http://www.uni-regensburg.de/physics/hep/people/professors/schaefer/, University of Regensburg, Germany
homepages/05/6123,
Michael L. Smith, Home Page, https://scholar.google.com/citations?user=-tavTMUAAAAJ, University of Virginia, Charlottesville, VA, USA
homepages/40/1402,
Philip Ciufo and Phil Ciufo, Home Page, http://orcid.org/0000-0002-0190-7785, University of Wollongong, School of Electrical, Computer, and Telecommunications Engineering, Australia
homepages/79/7963,
Andreas Schäfer, Home Page, http://www.cbs.mpg.de/employees/44836/189246, University of Nottingham, School of Physics and Astronomy, UK
homepages/99/395,
Catherine A. Meadows, Home Page, http://andrej.com/mathematicians/M/Meadows_Cathy.html, Naval Research Laboratory (NRL), Washington DC, USA