| article html file updated | 7 February 2020 22:51 CET | Update | https://www.mdpi.com/2079-9268/7/1/4 |
| article html file updated | 23 September 2019 04:56 CEST | Update | N/A |
| article html file updated | 4 May 2019 12:21 CEST | Update | N/A |
| article html file updated | 8 February 2017 13:27 CET | Original file | N/A |
| article xml uploaded. | 8 February 2017 13:26 CET | Original file | https://www.mdpi.com/2079-9268/7/1/4/xml |
| article pdf uploaded. | 8 February 2017 13:26 CET | Version of Record | https://www.mdpi.com/2079-9268/7/1/4/pdf |
