| article html file updated | 8 February 2020 18:52 CET | Update | https://www.mdpi.com/2079-9276/6/4/57 |
| article html file updated | 27 September 2019 20:55 CEST | Update | N/A |
| article html file updated | 2 May 2019 20:18 CEST | Update | N/A |
| article html file updated | 2 January 2018 10:31 CET | Update | N/A |
| article html file updated | 19 October 2017 12:34 CEST | Original file | N/A |
| article xml uploaded. | 19 October 2017 12:33 CEST | Original file | https://www.mdpi.com/2079-9276/6/4/57/xml |
| article pdf uploaded. | 19 October 2017 12:33 CEST | Version of Record | https://www.mdpi.com/2079-9276/6/4/57/pdf |
