| article html file updated | 6 February 2020 15:00 CET | Update | https://www.mdpi.com/2076-3921/4/1/22 |
| article html file updated | 7 May 2019 02:52 CEST | Update | N/A |
| article html file updated | 25 March 2019 20:09 CET | Update | N/A |
| article html file updated | 21 August 2015 05:25 CEST | Update | N/A |
| article html file updated | 20 January 2015 08:37 CET | Original file | N/A |
| article xml file uploaded | 20 January 2015 08:37 CET | Original file | https://www.mdpi.com/2076-3921/4/1/22/xml |
| article pdf uploaded. | 7 January 2015 17:38 CET | Version of Record | https://www.mdpi.com/2076-3921/4/1/22/pdf |
