| article html file updated | 7 February 2020 17:08 CET | Update | https://www.mdpi.com/2227-9709/3/4/21 |
| article html file updated | 22 September 2019 04:10 CEST | Update | N/A |
| article html file updated | 5 May 2019 00:10 CEST | Update | N/A |
| article html file updated | 30 October 2017 08:34 CET | Update | N/A |
| article html file updated | 27 October 2017 10:23 CEST | Update | N/A |
| article html file updated | 28 October 2016 09:15 CEST | Original file | N/A |
| article xml uploaded. | 28 October 2016 09:13 CEST | Update | https://www.mdpi.com/2227-9709/3/4/21/xml |
| article xml uploaded. | 28 October 2016 09:13 CEST | Original file | N/A |
| article pdf uploaded. | 28 October 2016 09:13 CEST | Version of Record | https://www.mdpi.com/2227-9709/3/4/21/pdf |
