| article html file updated | 29 August 2025 22:55 CEST | Update | https://www.mdpi.com/1996-1073/9/4/272 |
| article html file updated | 16 July 2022 02:07 CEST | Update | - |
| article html file updated | 7 February 2020 06:52 CET | Update | - |
| article html file updated | 5 May 2019 19:31 CEST | Update | - |
| article html file updated | 27 March 2019 01:06 CET | Update | - |
| article html file updated | 28 April 2016 07:55 CEST | Update | - |
| article html file updated | 6 April 2016 11:12 CEST | Original file | - |
| article xml uploaded. | 6 April 2016 11:11 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/272/xml |
| article pdf uploaded. | 6 April 2016 11:11 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/272/pdf |
