| article html file updated | 7 February 2020 00:22 CET | Update | https://www.mdpi.com/2227-7072/3/4/510 |
| article html file updated | 6 May 2019 08:09 CEST | Update | N/A |
| article html file updated | 26 March 2019 13:39 CET | Original file | N/A |
| article pdf uploaded. | 29 October 2015 11:57 CET | Version of Record | https://www.mdpi.com/2227-7072/3/4/510/pdf |
