| article html file updated | 9 February 2020 02:05 CET | Update | https://www.mdpi.com/2076-0787/7/1/4 |
| article html file updated | 2 May 2019 04:15 CEST | Update | N/A |
| article html file updated | 18 April 2019 02:21 CEST | Update | N/A |
| article html file updated | 28 March 2019 13:18 CET | Update | N/A |
| article html file updated | 5 January 2018 09:29 CET | Original file | N/A |
| article xml uploaded. | 5 January 2018 09:28 CET | Original file | https://www.mdpi.com/2076-0787/7/1/4/xml |
| article pdf uploaded. | 5 January 2018 09:28 CET | Version of Record | https://www.mdpi.com/2076-0787/7/1/4/pdf |
