| article html file updated | 7 February 2020 20:10 CET | Update | https://www.mdpi.com/2220-9964/6/1/2 |
| article html file updated | 22 September 2019 14:27 CEST | Update | N/A |
| article html file updated | 4 May 2019 18:05 CEST | Update | N/A |
| article html file updated | 8 February 2017 08:39 CET | Update | N/A |
| article html file updated | 23 December 2016 07:24 CET | Original file | N/A |
| article xml uploaded. | 23 December 2016 07:22 CET | Update | https://www.mdpi.com/2220-9964/6/1/2/xml |
| article xml uploaded. | 23 December 2016 07:22 CET | Original file | N/A |
| article pdf uploaded. | 23 December 2016 07:22 CET | Version of Record | https://www.mdpi.com/2220-9964/6/1/2/pdf |
