| article html file updated | 7 February 2020 05:48 CET | Update | https://www.mdpi.com/2079-9268/6/1/4 |
| article html file updated | 5 May 2019 21:40 CEST | Update | N/A |
| article html file updated | 26 March 2019 23:18 CET | Original file | N/A |
| article pdf uploaded. | 11 March 2016 15:36 CET | Version of Record | https://www.mdpi.com/2079-9268/6/1/4/pdf |
| article xml uploaded. | 11 March 2016 15:36 CET | Original file | https://www.mdpi.com/2079-9268/6/1/4/xml |
