| article html file updated | 9 February 2020 06:04 CET | Update | https://www.mdpi.com/2218-1997/4/2/32 |
| article html file updated | 30 September 2019 15:58 CEST | Update | N/A |
| article html file updated | 1 May 2019 19:44 CEST | Update | N/A |
| article html file updated | 17 April 2019 18:51 CEST | Update | N/A |
| article html file updated | 28 March 2019 22:07 CET | Update | N/A |
| article html file updated | 14 March 2018 09:42 CET | Update | N/A |
| article html file updated | 9 February 2018 11:50 CET | Original file | N/A |
| article xml uploaded. | 9 February 2018 11:33 CET | Update | https://www.mdpi.com/2218-1997/4/2/32/xml |
| article xml uploaded. | 9 February 2018 11:33 CET | Original file | N/A |
| article pdf uploaded. | 9 February 2018 11:33 CET | Version of Record | https://www.mdpi.com/2218-1997/4/2/32/pdf |
