| article html file updated | 7 February 2020 02:40 CET | Update | https://www.mdpi.com/2071-1050/8/1/18 |
| article html file updated | 6 May 2019 04:03 CEST | Update | - |
| article html file updated | 26 March 2019 17:11 CET | Original file | - |
| article pdf uploaded. | 24 December 2015 12:40 CET | Version of Record | https://www.mdpi.com/2071-1050/8/1/18/pdf |
| article xml uploaded. | 24 December 2015 12:40 CET | Original file | https://www.mdpi.com/2071-1050/8/1/18/xml |
