| article html file updated | 7 February 2020 03:16 CET | Update | https://www.mdpi.com/2073-4344/6/1/9 |
| article html file updated | 6 May 2019 02:53 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:08 CET | Original file | N/A |
| article pdf uploaded. | 11 January 2016 14:04 CET | Version of Record | https://www.mdpi.com/2073-4344/6/1/9/pdf |
| article xml uploaded. | 11 January 2016 14:04 CET | Original file | https://www.mdpi.com/2073-4344/6/1/9/xml |
