1. Department of Mathematical Sciences, Appalachian State University, NC, USA. davisc3@appstate.edu
2. Department of Mathematics, The University of Chicago, IL, USA. drh@math.uchicago.edu
3. Department of Mathematical Sciences, Appalachian State University, NC, USA. hirstjl@appstate.edu
4. Department of Mathematical Sciences, Appalachian State University, NC, USA. pardo@alumni.nd.edu
5. Department of Computer Science, Swansea University, United Kingdom. arno.m.pauly@gmail.com
6. School of Information Science, Japan Advanced Institute of Science and Technology, Japan. y-keita@jaist.ac.jp