| article html file updated | 7 February 2020 23:12 CET | Update | https://www.mdpi.com/2218-1997/3/1/9 |
| article html file updated | 23 September 2019 06:52 CEST | Update | N/A |
| article html file updated | 4 May 2019 11:38 CEST | Update | N/A |
| article html file updated | 30 March 2017 03:36 CEST | Update | N/A |
| article html file updated | 11 February 2017 09:57 CET | Original file | N/A |
| article xml uploaded. | 11 February 2017 09:56 CET | Original file | https://www.mdpi.com/2218-1997/3/1/9/xml |
| article pdf uploaded. | 11 February 2017 09:56 CET | Version of Record | https://www.mdpi.com/2218-1997/3/1/9/pdf |
