| article html file updated | 7 February 2020 21:17 CET | Update | https://www.mdpi.com/2304-8158/6/1/4 |
| article html file updated | 22 September 2019 20:23 CEST | Update | - |
| article html file updated | 4 May 2019 15:44 CEST | Update | - |
| article html file updated | 8 February 2017 12:25 CET | Update | - |
| article html file updated | 12 January 2017 05:30 CET | Update | - |
| article xml uploaded. | 12 January 2017 05:29 CET | Update | https://www.mdpi.com/2304-8158/6/1/4/xml |
| article pdf uploaded. | 12 January 2017 05:29 CET | Updated version of record | https://www.mdpi.com/2304-8158/6/1/4/pdf |
| article html file updated | 12 January 2017 04:59 CET | Original file | - |
| article xml uploaded. | 12 January 2017 04:58 CET | Original file | - |
| article pdf uploaded. | 12 January 2017 04:58 CET | Version of Record | - |
