| article html file updated | 29 August 2025 23:37 CEST | Update | https://www.mdpi.com/2218-1997/2/3/21 |
| article html file updated | 20 August 2025 22:24 CEST | Update | N/A |
| article html file updated | 7 February 2020 14:50 CET | Update | N/A |
| article html file updated | 5 May 2019 04:22 CEST | Update | N/A |
| article html file updated | 11 October 2016 07:25 CEST | Update | N/A |
| article html file updated | 12 September 2016 08:39 CEST | Original file | N/A |
| article xml uploaded. | 12 September 2016 08:38 CEST | Original file | https://www.mdpi.com/2218-1997/2/3/21/xml |
| article pdf uploaded. | 12 September 2016 08:38 CEST | Version of Record | https://www.mdpi.com/2218-1997/2/3/21/pdf |