| article html file updated | 7 February 2020 21:35 CET | Update | https://www.mdpi.com/2075-1702/5/1/4 |
| article html file updated | 22 September 2019 22:01 CEST | Update | N/A |
| article html file updated | 4 May 2019 14:59 CEST | Update | N/A |
| article html file updated | 30 March 2017 05:38 CEST | Update | N/A |
| article html file updated | 17 January 2017 08:41 CET | Original file | N/A |
| article xml uploaded. | 17 January 2017 08:40 CET | Original file | https://www.mdpi.com/2075-1702/5/1/4/xml |
| article pdf uploaded. | 17 January 2017 08:40 CET | Version of Record | https://www.mdpi.com/2075-1702/5/1/4/pdf |
