| article html file updated | 7 February 2020 02:57 CET | Update | https://www.mdpi.com/2071-1050/8/1/39 |
| article html file updated | 6 May 2019 03:30 CEST | Update | - |
| article html file updated | 26 March 2019 17:35 CET | Original file | - |
| article pdf uploaded. | 31 December 2015 12:17 CET | Version of Record | https://www.mdpi.com/2071-1050/8/1/39/pdf |
| article xml uploaded. | 31 December 2015 12:17 CET | Original file | https://www.mdpi.com/2071-1050/8/1/39/xml |
