| article html file updated | 7 February 2020 03:06 CET | Update | https://www.mdpi.com/1999-4907/7/1/15 |
| article html file updated | 6 May 2019 03:12 CEST | Update | - |
| article html file updated | 26 March 2019 17:51 CET | Original file | - |
| article pdf uploaded. | 6 January 2016 14:16 CET | Version of Record | https://www.mdpi.com/1999-4907/7/1/15/pdf |
| article xml uploaded. | 6 January 2016 14:16 CET | Original file | https://www.mdpi.com/1999-4907/7/1/15/xml |
