| article html file updated | 7 February 2020 21:51 CET | Update | https://www.mdpi.com/2304-8158/6/1/9 |
| article html file updated | 22 September 2019 23:31 CEST | Update | - |
| article html file updated | 4 May 2019 14:20 CEST | Update | - |
| article html file updated | 8 February 2017 12:26 CET | Update | - |
| article html file updated | 20 January 2017 14:16 CET | Original file | - |
| article xml uploaded. | 20 January 2017 14:15 CET | Original file | https://www.mdpi.com/2304-8158/6/1/9/xml |
| article pdf uploaded. | 20 January 2017 14:15 CET | Version of Record | https://www.mdpi.com/2304-8158/6/1/9/pdf |
