| article html file updated | 8 February 2020 02:53 CET | Update | https://www.mdpi.com/2227-9067/4/4/20 |
| article html file updated | 4 May 2019 03:39 CEST | Update | N/A |
| article html file updated | 28 April 2017 05:42 CEST | Update | N/A |
| article html file updated | 18 April 2017 09:52 CEST | Update | N/A |
| article xml uploaded. | 18 April 2017 09:50 CEST | Update | https://www.mdpi.com/2227-9067/4/4/20/xml |
| article pdf uploaded. | 18 April 2017 09:50 CEST | Updated version of record | https://www.mdpi.com/2227-9067/4/4/20/pdf |
| article html file updated | 6 April 2017 13:35 CEST | Original file | N/A |
| article pdf uploaded. | 6 April 2017 13:34 CEST | Updated version of record | N/A |
