| article html file updated | 8 February 2020 03:09 CET | Update | https://www.mdpi.com/2227-9709/4/2/7 |
| article html file updated | 24 September 2019 05:24 CEST | Update | N/A |
| article html file updated | 4 May 2019 03:03 CEST | Update | N/A |
| article html file updated | 27 October 2017 10:25 CEST | Update | N/A |
| article html file updated | 8 April 2017 12:43 CEST | Original file | N/A |
| article xml uploaded. | 8 April 2017 12:42 CEST | Original file | https://www.mdpi.com/2227-9709/4/2/7/xml |
| article pdf uploaded. | 8 April 2017 12:42 CEST | Version of Record | https://www.mdpi.com/2227-9709/4/2/7/pdf |
