| article html file updated | 8 February 2020 22:31 CET | Update | https://www.mdpi.com/2079-9276/6/4/67 |
| article html file updated | 28 September 2019 19:59 CEST | Update | - |
| article html file updated | 2 May 2019 12:02 CEST | Update | - |
| article html file updated | 18 April 2019 09:38 CEST | Update | - |
| article html file updated | 2 January 2018 10:28 CET | Update | - |
| article html file updated | 29 November 2017 08:34 CET | Original file | - |
| article xml uploaded. | 29 November 2017 08:33 CET | Original file | https://www.mdpi.com/2079-9276/6/4/67/xml |
| article pdf uploaded. | 29 November 2017 08:33 CET | Version of Record | https://www.mdpi.com/2079-9276/6/4/67/pdf |
