| article html file updated | 7 February 2020 02:21 CET | Update | https://www.mdpi.com/1999-4907/6/12/4391 |
| article html file updated | 6 May 2019 04:44 CEST | Update | N/A |
| article html file updated | 26 March 2019 16:40 CET | Original file | N/A |
| article xml uploaded. | 17 December 2015 14:53 CET | Original file | https://www.mdpi.com/1999-4907/6/12/4391/xml |
| article pdf uploaded. | 17 December 2015 14:53 CET | Version of Record | https://www.mdpi.com/1999-4907/6/12/4391/pdf |
