| article html file updated | 7 February 2020 22:53 CET | Update | https://www.mdpi.com/2227-9709/4/1/6 |
| article html file updated | 23 September 2019 05:08 CEST | Update | N/A |
| article html file updated | 4 May 2019 12:16 CEST | Update | N/A |
| article html file updated | 27 October 2017 10:25 CEST | Update | N/A |
| article html file updated | 8 February 2017 12:05 CET | Original file | N/A |
| article xml uploaded. | 8 February 2017 12:04 CET | Update | https://www.mdpi.com/2227-9709/4/1/6/xml |
| article xml uploaded. | 8 February 2017 12:04 CET | Original file | N/A |
| article pdf uploaded. | 8 February 2017 12:04 CET | Version of Record | https://www.mdpi.com/2227-9709/4/1/6/pdf |
