| article html file updated | 7 February 2020 03:10 CET | Update | https://www.mdpi.com/2071-1050/8/1/52 |
| article html file updated | 6 May 2019 03:04 CEST | Update | N/A |
| article html file updated | 26 March 2019 17:57 CET | Original file | N/A |
| article pdf uploaded. | 7 January 2016 15:43 CET | Version of Record | https://www.mdpi.com/2071-1050/8/1/52/pdf |
| article xml uploaded. | 7 January 2016 15:43 CET | Original file | https://www.mdpi.com/2071-1050/8/1/52/xml |
