| article html file updated | 9 February 2020 06:30 CET | Update | https://www.mdpi.com/2218-1997/4/2/37 |
| article html file updated | 30 September 2019 18:32 CEST | Update | N/A |
| article html file updated | 1 May 2019 18:44 CEST | Update | N/A |
| article html file updated | 17 April 2019 18:00 CEST | Update | N/A |
| article html file updated | 28 March 2019 23:02 CET | Update | N/A |
| article html file updated | 14 March 2018 09:43 CET | Update | N/A |
| article html file updated | 13 February 2018 08:44 CET | Original file | N/A |
| article xml uploaded. | 13 February 2018 08:43 CET | Original file | https://www.mdpi.com/2218-1997/4/2/37/xml |
| article pdf uploaded. | 13 February 2018 08:43 CET | Version of Record | https://www.mdpi.com/2218-1997/4/2/37/pdf |
