| article html file updated | 8 February 2020 07:05 CET | Update | https://www.mdpi.com/2071-1050/9/6/921 |
| article html file updated | 25 September 2019 02:17 CEST | Update | - |
| article html file updated | 3 May 2019 19:43 CEST | Update | - |
| article html file updated | 28 June 2017 14:35 CEST | Update | - |
| article html file updated | 2 June 2017 03:49 CEST | Original file | - |
| article xml uploaded. | 2 June 2017 03:48 CEST | Original file | https://www.mdpi.com/2071-1050/9/6/921/xml |
| article pdf uploaded. | 2 June 2017 03:48 CEST | Updated version of record | https://www.mdpi.com/2071-1050/9/6/921/pdf |
| article pdf uploaded. | 31 May 2017 11:35 CEST | Version of Record | https://www.mdpi.com/2071-1050/9/6/921/pdf-vor |
