| article html file updated | 7 February 2020 21:03 CET | Update | https://www.mdpi.com/2073-4425/8/1/21 |
| article html file updated | 22 September 2019 19:23 CEST | Update | N/A |
| article html file updated | 4 May 2019 16:14 CEST | Update | N/A |
| article html file updated | 7 February 2017 12:19 CET | Update | N/A |
| article html file updated | 9 January 2017 10:56 CET | Original file | N/A |
| article xml uploaded. | 9 January 2017 10:55 CET | Original file | https://www.mdpi.com/2073-4425/8/1/21/xml |
| article pdf uploaded. | 9 January 2017 10:55 CET | Version of Record | https://www.mdpi.com/2073-4425/8/1/21/pdf |
