| article html file updated | 29 August 2025 23:10 CEST | Update | https://www.mdpi.com/2076-393X/4/2/21 |
| article html file updated | 16 July 2022 02:32 CEST | Update | - |
| article html file updated | 7 February 2020 09:34 CET | Update | - |
| article html file updated | 5 May 2019 14:05 CEST | Update | - |
| article html file updated | 27 March 2019 06:18 CET | Update | - |
| article html file updated | 4 July 2016 11:49 CEST | Update | - |
| article html file updated | 1 June 2016 08:42 CEST | Original file | - |
| article xml uploaded. | 1 June 2016 08:41 CEST | Original file | https://www.mdpi.com/2076-393X/4/2/21/xml |
| article pdf uploaded. | 1 June 2016 08:41 CEST | Version of Record | https://www.mdpi.com/2076-393X/4/2/21/pdf |