| article html file updated | 7 February 2020 07:30 CET | Update | https://www.mdpi.com/1999-4907/7/4/87 |
| article html file updated | 5 May 2019 18:09 CEST | Update | N/A |
| article html file updated | 27 March 2019 02:22 CET | Update | N/A |
| article html file updated | 28 April 2016 12:23 CEST | Update | N/A |
| article html file updated | 20 April 2016 10:48 CEST | Original file | N/A |
| article xml uploaded. | 20 April 2016 10:46 CEST | Original file | https://www.mdpi.com/1999-4907/7/4/87/xml |
| article pdf uploaded. | 20 April 2016 10:46 CEST | Version of Record | https://www.mdpi.com/1999-4907/7/4/87/pdf |
