| article html file updated | 8 February 2020 07:57 CET | Update | https://www.mdpi.com/1999-4907/8/6/206 |
| article html file updated | 25 September 2019 06:42 CEST | Update | - |
| article html file updated | 3 May 2019 18:04 CEST | Update | - |
| article html file updated | 27 June 2017 11:19 CEST | Update | - |
| article html file updated | 10 June 2017 11:51 CEST | Original file | - |
| article xml uploaded. | 10 June 2017 11:49 CEST | Update | https://www.mdpi.com/1999-4907/8/6/206/xml |
| article pdf uploaded. | 10 June 2017 11:49 CEST | Version of Record | https://www.mdpi.com/1999-4907/8/6/206/pdf |
