| article html file updated | 7 February 2020 23:26 CET | Update | https://www.mdpi.com/2075-163X/7/2/21 |
| article html file updated | 23 September 2019 08:10 CEST | Update | N/A |
| article html file updated | 4 May 2019 11:10 CEST | Update | N/A |
| article html file updated | 1 March 2017 10:22 CET | Update | N/A |
| article html file updated | 15 February 2017 10:31 CET | Original file | N/A |
| article xml uploaded. | 15 February 2017 10:29 CET | Original file | https://www.mdpi.com/2075-163X/7/2/21/xml |
| article pdf uploaded. | 15 February 2017 10:29 CET | Version of Record | https://www.mdpi.com/2075-163X/7/2/21/pdf |
