| article html file updated | 7 February 2020 22:23 CET | Update | https://www.mdpi.com/2076-3921/6/1/9 |
| article html file updated | 23 September 2019 02:22 CEST | Update | N/A |
| article html file updated | 4 May 2019 13:17 CEST | Update | N/A |
| article html file updated | 29 March 2017 08:18 CEST | Update | N/A |
| article html file updated | 3 February 2017 11:37 CET | Original file | N/A |
| article xml uploaded. | 3 February 2017 11:35 CET | Original file | https://www.mdpi.com/2076-3921/6/1/9/xml |
| article pdf uploaded. | 3 February 2017 11:35 CET | Updated version of record | https://www.mdpi.com/2076-3921/6/1/9/pdf |
| article pdf uploaded. | 28 January 2017 02:09 CET | Version of Record | https://www.mdpi.com/2076-3921/6/1/9/pdf-vor |
