| article html file updated | 7 February 2020 04:22 CET | Update | https://www.mdpi.com/2079-3200/4/1/2 |
| article html file updated | 6 May 2019 00:46 CEST | Update | N/A |
| article html file updated | 26 March 2019 20:19 CET | Original file | N/A |
| article pdf uploaded. | 16 February 2016 05:06 CET | Updated version of record | https://www.mdpi.com/2079-3200/4/1/2/pdf |
| article xml uploaded. | 16 February 2016 05:06 CET | Original file | https://www.mdpi.com/2079-3200/4/1/2/xml |
| article pdf uploaded. | 6 February 2016 03:25 CET | Version of Record | https://www.mdpi.com/2079-3200/4/1/2/pdf-vor |
