| article html file updated | 9 February 2020 12:20 CET | Update | https://www.mdpi.com/2223-7747/7/2/30 |
| article html file updated | 1 May 2019 06:29 CEST | Update | - |
| article html file updated | 17 April 2019 06:33 CEST | Update | - |
| article html file updated | 29 March 2019 12:17 CET | Update | - |
| article html file updated | 27 June 2018 14:04 CEST | Update | - |
| article html file updated | 3 April 2018 13:53 CEST | Original file | - |
| article xml uploaded. | 3 April 2018 08:53 CEST | Original file | https://www.mdpi.com/2223-7747/7/2/30/xml |
| article pdf uploaded. | 3 April 2018 08:53 CEST | Version of Record | https://www.mdpi.com/2223-7747/7/2/30/pdf |
