| article html file updated | 7 February 2020 20:01 CET | Update | https://www.mdpi.com/2218-1997/2/4/34 |
| article html file updated | 22 September 2019 13:40 CEST | Update | - |
| article html file updated | 4 May 2019 18:24 CEST | Update | - |
| article html file updated | 29 December 2016 06:49 CET | Update | - |
| article html file updated | 21 December 2016 06:36 CET | Original file | - |
| article xml uploaded. | 21 December 2016 06:35 CET | Update | https://www.mdpi.com/2218-1997/2/4/34/xml |
| article pdf uploaded. | 21 December 2016 06:35 CET | Updated version of record | https://www.mdpi.com/2218-1997/2/4/34/pdf |
| article xml uploaded. | 21 December 2016 06:10 CET | Original file | - |
| article pdf uploaded. | 21 December 2016 06:10 CET | Version of Record | - |
