| article html file updated | 29 August 2025 22:35 CEST | Update | https://www.mdpi.com/1424-8247/9/1/2 |
| article html file updated | 16 July 2022 01:36 CEST | Update | N/A |
| article html file updated | 7 February 2020 03:22 CET | Update | N/A |
| article html file updated | 6 May 2019 02:42 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:19 CET | Update | N/A |
| article html file updated | 27 October 2017 10:46 CEST | Update | N/A |
| article html file updated | 30 March 2016 12:07 CEST | Original file | N/A |
| article pdf uploaded. | 13 January 2016 11:31 CET | Version of Record | https://www.mdpi.com/1424-8247/9/1/2/pdf |
| article xml uploaded. | 13 January 2016 11:31 CET | Original file | https://www.mdpi.com/1424-8247/9/1/2/xml |