| article html file updated | 7 February 2020 11:53 CET | Update | https://www.mdpi.com/2227-7102/6/3/21 |
| article html file updated | 21 September 2019 21:13 CEST | Update | - |
| article html file updated | 5 May 2019 09:49 CEST | Update | - |
| article html file updated | 27 March 2019 10:38 CET | Update | - |
| article html file updated | 9 November 2017 12:35 CET | Update | - |
| article html file updated | 27 October 2017 10:02 CEST | Update | - |
| article html file updated | 19 July 2016 08:42 CEST | Original file | - |
| article xml uploaded. | 19 July 2016 08:41 CEST | Original file | https://www.mdpi.com/2227-7102/6/3/21/xml |
| article pdf uploaded. | 19 July 2016 08:41 CEST | Version of Record | https://www.mdpi.com/2227-7102/6/3/21/pdf |
