| article html file updated | 6 February 2020 21:24 CET | Update | https://www.mdpi.com/2218-1997/1/2/173 |
| article html file updated | 6 May 2019 14:19 CEST | Update | N/A |
| article html file updated | 26 March 2019 08:00 CET | Update | N/A |
| article html file updated | 29 March 2016 12:59 CEST | Update | N/A |
| article html file updated | 16 October 2015 13:11 CEST | Original file | N/A |
| article xml file uploaded | 16 October 2015 13:11 CEST | Original file | https://www.mdpi.com/2218-1997/1/2/173/xml |
| article pdf uploaded. | 5 August 2015 09:36 CEST | Updated version of record | https://www.mdpi.com/2218-1997/1/2/173/pdf |
| article pdf uploaded. | 4 August 2015 15:59 CEST | Version of Record | https://www.mdpi.com/2218-1997/1/2/173/pdf-vor |
