| article html file updated | 8 February 2020 03:10 CET | Update | https://www.mdpi.com/2077-0383/6/4/44 |
| article html file updated | 24 September 2019 05:27 CEST | Update | - |
| article html file updated | 4 May 2019 03:02 CEST | Update | - |
| article html file updated | 28 April 2017 06:48 CEST | Update | - |
| article html file updated | 10 April 2017 08:59 CEST | Original file | - |
| article xml uploaded. | 10 April 2017 08:58 CEST | Original file | https://www.mdpi.com/2077-0383/6/4/44/xml |
| article pdf uploaded. | 10 April 2017 08:58 CEST | Updated version of record | https://www.mdpi.com/2077-0383/6/4/44/pdf |
| article pdf uploaded. | 8 April 2017 13:17 CEST | Version of Record | https://www.mdpi.com/2077-0383/6/4/44/pdf-vor |
