| article html file updated | 9 February 2020 01:59 CET | Update | https://www.mdpi.com/2218-1997/4/1/12 |
| article html file updated | 29 September 2019 16:09 CEST | Update | N/A |
| article html file updated | 2 May 2019 04:28 CEST | Update | N/A |
| article html file updated | 18 April 2019 02:33 CEST | Update | N/A |
| article html file updated | 28 March 2019 13:04 CET | Update | N/A |
| article html file updated | 1 February 2018 11:50 CET | Update | N/A |
| article pdf uploaded. | 5 January 2018 10:29 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/1/12/pdf |
| article html file updated | 4 January 2018 10:20 CET | Original file | N/A |
| article xml uploaded. | 4 January 2018 10:19 CET | Original file | https://www.mdpi.com/2218-1997/4/1/12/xml |
| article pdf uploaded. | 4 January 2018 10:19 CET | Version of Record | https://www.mdpi.com/2218-1997/4/1/12/pdf-vor |
