| article html file updated | 8 February 2020 19:51 CET | Update | https://www.mdpi.com/2218-1997/3/4/74 |
| article html file updated | 2 May 2019 18:02 CEST | Update | N/A |
| article html file updated | 2 January 2018 14:45 CET | Update | N/A |
| article html file updated | 1 November 2017 09:07 CET | Original file | N/A |
| article xml uploaded. | 1 November 2017 09:06 CET | Original file | https://www.mdpi.com/2218-1997/3/4/74/xml |
| article pdf uploaded. | 1 November 2017 09:06 CET | Updated version of record | https://www.mdpi.com/2218-1997/3/4/74/pdf |
| article pdf uploaded. | 30 October 2017 14:36 CET | Version of Record | https://www.mdpi.com/2218-1997/3/4/74/pdf-vor |
