| article html file updated | 7 February 2020 20:39 CET | Update | https://www.mdpi.com/2218-1997/3/1/2 |
| article html file updated | 22 September 2019 17:11 CEST | Update | N/A |
| article html file updated | 4 May 2019 17:05 CEST | Update | N/A |
| article html file updated | 30 March 2017 03:34 CEST | Update | N/A |
| article html file updated | 1 January 2017 08:03 CET | Original file | N/A |
| article xml uploaded. | 1 January 2017 08:02 CET | Original file | https://www.mdpi.com/2218-1997/3/1/2/xml |
| article pdf uploaded. | 1 January 2017 08:02 CET | Version of Record | https://www.mdpi.com/2218-1997/3/1/2/pdf |
