| article html file updated | 7 February 2020 07:40 CET | Update | https://www.mdpi.com/1999-4907/7/4/91 |
| article html file updated | 5 May 2019 17:49 CEST | Update | N/A |
| article html file updated | 27 March 2019 02:44 CET | Update | N/A |
| article html file updated | 28 April 2016 12:27 CEST | Update | N/A |
| article html file updated | 22 April 2016 11:17 CEST | Original file | N/A |
| article xml uploaded. | 22 April 2016 11:16 CEST | Original file | https://www.mdpi.com/1999-4907/7/4/91/xml |
| article pdf uploaded. | 22 April 2016 11:15 CEST | Version of Record | https://www.mdpi.com/1999-4907/7/4/91/pdf |
