| article html file updated | 19 March 2021 01:27 CET | Update | https://www.mdpi.com/2223-7747/6/1/7 |
| article xml uploaded. | 19 March 2021 01:25 CET | Update | https://www.mdpi.com/2223-7747/6/1/7/xml |
| article pdf uploaded. | 19 March 2021 01:25 CET | Updated version of record | https://www.mdpi.com/2223-7747/6/1/7/pdf |
| article html file updated | 7 February 2020 23:04 CET | Update | - |
| article html file updated | 23 September 2019 06:11 CEST | Update | - |
| article html file updated | 4 May 2019 11:53 CEST | Update | - |
| article html file updated | 30 March 2017 09:40 CEST | Update | - |
| article html file updated | 10 February 2017 12:37 CET | Original file | - |
| article xml uploaded. | 10 February 2017 12:36 CET | Original file | - |
| article pdf uploaded. | 10 February 2017 12:36 CET | Version of Record | https://www.mdpi.com/2223-7747/6/1/7/pdf-vor |
