| article html file updated | 9 February 2020 01:43 CET | Update | https://www.mdpi.com/2218-1997/4/1/3 |
| article html file updated | 2 May 2019 05:00 CEST | Update | N/A |
| article html file updated | 18 April 2019 03:04 CEST | Update | N/A |
| article html file updated | 28 March 2019 12:26 CET | Update | N/A |
| article html file updated | 1 February 2018 11:57 CET | Update | N/A |
| article html file updated | 2 January 2018 07:21 CET | Original file | N/A |
| article xml uploaded. | 2 January 2018 07:19 CET | Original file | https://www.mdpi.com/2218-1997/4/1/3/xml |
| article pdf uploaded. | 2 January 2018 07:19 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/1/3/pdf |
| article pdf uploaded. | 1 January 2018 11:58 CET | Version of Record | https://www.mdpi.com/2218-1997/4/1/3/pdf-vor |
