| article html file updated | 7 February 2020 03:03 CET | Update | https://www.mdpi.com/2076-2615/6/1/2 |
| article html file updated | 6 May 2019 03:18 CEST | Update | - |
| article html file updated | 26 March 2019 17:46 CET | Original file | - |
| article pdf uploaded. | 5 January 2016 16:00 CET | Version of Record | https://www.mdpi.com/2076-2615/6/1/2/pdf |
| article xml uploaded. | 5 January 2016 16:00 CET | Original file | https://www.mdpi.com/2076-2615/6/1/2/xml |
