| article html file updated | 7 February 2020 02:42 CET | Update | https://www.mdpi.com/1999-4907/7/1/6 |
| article html file updated | 6 May 2019 03:59 CEST | Update | - |
| article html file updated | 26 March 2019 17:14 CET | Original file | - |
| article pdf uploaded. | 28 December 2015 11:01 CET | Updated version of record | https://www.mdpi.com/1999-4907/7/1/6/pdf |
| article xml uploaded. | 28 December 2015 11:01 CET | Update | https://www.mdpi.com/1999-4907/7/1/6/xml |
| article pdf uploaded. | 25 December 2015 03:29 CET | Version of Record | https://www.mdpi.com/1999-4907/7/1/6/pdf-vor |
| article xml uploaded. | 25 December 2015 03:29 CET | Original file | - |
