| article html file updated | 8 February 2020 02:59 CET | Update | https://www.mdpi.com/1660-3397/15/4/109 |
| article html file updated | 24 September 2019 04:28 CEST | Update | - |
| article html file updated | 4 May 2019 03:23 CEST | Update | - |
| article html file updated | 28 April 2017 08:22 CEST | Update | - |
| article html file updated | 10 April 2017 05:05 CEST | Original file | - |
| article xml uploaded. | 10 April 2017 05:04 CEST | Original file | https://www.mdpi.com/1660-3397/15/4/109/xml |
| article pdf uploaded. | 10 April 2017 05:04 CEST | Updated version of record | https://www.mdpi.com/1660-3397/15/4/109/pdf |
| article pdf uploaded. | 6 April 2017 10:57 CEST | Version of Record | https://www.mdpi.com/1660-3397/15/4/109/pdf-vor |
