| article html file updated | 7 February 2020 03:43 CET | Update | https://www.mdpi.com/1999-4907/7/1/26 |
| article html file updated | 6 May 2019 02:01 CEST | Update | - |
| article html file updated | 26 March 2019 19:01 CET | Original file | - |
| article xml uploaded. | 22 January 2016 03:43 CET | Original file | https://www.mdpi.com/1999-4907/7/1/26/xml |
| article pdf uploaded. | 22 January 2016 03:43 CET | Version of Record | https://www.mdpi.com/1999-4907/7/1/26/pdf |
