| article html file updated | 6 February 2020 06:12 CET | Update | https://www.mdpi.com/2076-0752/2/4/476 |
| article html file updated | 20 September 2019 04:22 CEST | Update | N/A |
| article html file updated | 7 May 2019 20:51 CEST | Update | N/A |
| article html file updated | 21 March 2019 09:26 CET | Update | N/A |
| article html file updated | 4 August 2017 05:26 CEST | Original file | N/A |
| article xml uploaded. | 4 August 2017 05:25 CEST | Update | https://www.mdpi.com/2076-0752/2/4/476/xml |
| article pdf uploaded. | 13 December 2013 16:56 CET | Version of Record | https://www.mdpi.com/2076-0752/2/4/476/pdf |
