| article html file updated | 7 February 2020 03:15 CET | Update | https://www.mdpi.com/2227-7382/4/1/2 |
| article html file updated | 6 May 2019 02:55 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:06 CET | Update | N/A |
| article html file updated | 18 May 2016 12:43 CEST | Original file | N/A |
| article pdf uploaded. | 11 January 2016 14:53 CET | Version of Record | https://www.mdpi.com/2227-7382/4/1/2/pdf |
| article xml uploaded. | 11 January 2016 14:53 CET | Original file | https://www.mdpi.com/2227-7382/4/1/2/xml |
