| article html file updated | 8 February 2020 17:19 CET | Update | https://www.mdpi.com/2079-9276/6/4/51 |
| article html file updated | 27 September 2019 10:02 CEST | Update | - |
| article html file updated | 2 May 2019 23:46 CEST | Update | - |
| article html file updated | 2 January 2018 10:29 CET | Update | - |
| article html file updated | 27 September 2017 14:57 CEST | Original file | - |
| article xml uploaded. | 27 September 2017 14:56 CEST | Update | https://www.mdpi.com/2079-9276/6/4/51/xml |
| article xml uploaded. | 27 September 2017 14:56 CEST | Original file | - |
| article pdf uploaded. | 27 September 2017 14:56 CEST | Version of Record | https://www.mdpi.com/2079-9276/6/4/51/pdf |
