| article html file updated | 7 February 2020 21:21 CET | Update | https://www.mdpi.com/2073-4352/7/1/21 |
| article html file updated | 22 September 2019 20:43 CEST | Update | N/A |
| article html file updated | 4 May 2019 15:34 CEST | Update | N/A |
| article html file updated | 7 February 2017 04:11 CET | Update | N/A |
| article html file updated | 12 January 2017 13:09 CET | Original file | N/A |
| article xml uploaded. | 12 January 2017 13:07 CET | Update | https://www.mdpi.com/2073-4352/7/1/21/xml |
| article xml uploaded. | 12 January 2017 13:07 CET | Original file | N/A |
| article pdf uploaded. | 12 January 2017 13:07 CET | Version of Record | https://www.mdpi.com/2073-4352/7/1/21/pdf |
