| article html file updated | 7 February 2020 03:52 CET | Update | https://www.mdpi.com/2079-9721/4/1/8 |
| article html file updated | 6 May 2019 01:45 CEST | Update | N/A |
| article html file updated | 26 March 2019 19:20 CET | Original file | N/A |
| article xml uploaded. | 26 January 2016 09:37 CET | Original file | https://www.mdpi.com/2079-9721/4/1/8/xml |
| article pdf uploaded. | 26 January 2016 09:37 CET | Version of Record | https://www.mdpi.com/2079-9721/4/1/8/pdf |
