| article html file updated | 8 February 2020 04:01 CET | Update | https://www.mdpi.com/2075-4698/7/2/9 |
| article html file updated | 4 May 2019 01:25 CEST | Update | - |
| article html file updated | 30 June 2017 09:15 CEST | Update | - |
| article html file updated | 23 June 2017 03:15 CEST | Original file | - |
| article xml uploaded. | 23 June 2017 03:14 CEST | Original file | https://www.mdpi.com/2075-4698/7/2/9/xml |
| article pdf uploaded. | 23 June 2017 03:14 CEST | Updated version of record | https://www.mdpi.com/2075-4698/7/2/9/pdf |
| article pdf uploaded. | 20 April 2017 14:10 CEST | Version of Record | https://www.mdpi.com/2075-4698/7/2/9/pdf-vor |
