. Author manuscript; available in PMC: 2018 Jun 21.
Published in final edited form as: Computation (Basel). 2018 Jan 31;6(1):9. doi: 10.3390/computation6010009
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).