| article html file updated | 8 February 2020 00:00 CET | Update | https://www.mdpi.com/2075-1680/6/1/4 |
| article html file updated | 23 September 2019 11:18 CEST | Update | - |
| article html file updated | 4 May 2019 10:01 CEST | Update | - |
| article html file updated | 27 March 2017 09:40 CEST | Update | - |
| article html file updated | 27 February 2017 02:00 CET | Original file | - |
| article xml uploaded. | 27 February 2017 01:59 CET | Original file | https://www.mdpi.com/2075-1680/6/1/4/xml |
| article pdf uploaded. | 27 February 2017 01:59 CET | Updated version of record | https://www.mdpi.com/2075-1680/6/1/4/pdf |
| article pdf uploaded. | 22 February 2017 11:03 CET | Version of Record | https://www.mdpi.com/2075-1680/6/1/4/pdf-vor |
