| article html file updated | 7 February 2020 07:41 CET | Update | https://www.mdpi.com/1999-4907/7/4/90 |
| article html file updated | 5 May 2019 17:48 CEST | Update | - |
| article html file updated | 27 March 2019 02:44 CET | Update | - |
| article html file updated | 28 April 2016 12:26 CEST | Update | - |
| article html file updated | 22 April 2016 11:36 CEST | Original file | - |
| article xml uploaded. | 22 April 2016 11:35 CEST | Original file | https://www.mdpi.com/1999-4907/7/4/90/xml |
| article pdf uploaded. | 22 April 2016 11:35 CEST | Version of Record | https://www.mdpi.com/1999-4907/7/4/90/pdf |
