| article html file updated | 7 February 2020 00:12 CET | Update | https://www.mdpi.com/2227-7072/3/4/482 |
| article html file updated | 6 May 2019 08:29 CEST | Update | N/A |
| article html file updated | 26 March 2019 13:21 CET | Original file | N/A |
| article pdf uploaded. | 23 October 2015 17:20 CEST | Version of Record | https://www.mdpi.com/2227-7072/3/4/482/pdf |
