| article html file updated | 7 February 2020 04:13 CET | Update | https://www.mdpi.com/2225-1146/4/1/6 |
| article html file updated | 6 May 2019 01:06 CEST | Update | - |
| article html file updated | 26 March 2019 19:59 CET | Update | - |
| article html file updated | 14 March 2018 09:52 CET | Original file | - |
| article pdf uploaded. | 3 February 2016 12:05 CET | Version of Record | https://www.mdpi.com/2225-1146/4/1/6/pdf |
| article xml uploaded. | 3 February 2016 12:05 CET | Original file | https://www.mdpi.com/2225-1146/4/1/6/xml |
