| article html file updated | 9 February 2020 07:15 CET | Update | https://www.mdpi.com/2076-3921/7/2/31 |
| article html file updated | 30 September 2019 22:56 CEST | Update | - |
| article html file updated | 1 May 2019 17:07 CEST | Update | - |
| article html file updated | 17 April 2019 16:31 CEST | Update | - |
| article html file updated | 29 March 2019 00:38 CET | Update | - |
| article html file updated | 14 March 2018 08:22 CET | Update | - |
| article html file updated | 22 February 2018 15:10 CET | Original file | - |
| article xml uploaded. | 22 February 2018 15:09 CET | Original file | https://www.mdpi.com/2076-3921/7/2/31/xml |
| article pdf uploaded. | 22 February 2018 15:09 CET | Version of Record | https://www.mdpi.com/2076-3921/7/2/31/pdf |
