| article html file updated | 8 February 2020 12:00 CET | Update | https://www.mdpi.com/2304-8158/6/8/57 |
| article html file updated | 26 September 2019 04:05 CEST | Update | - |
| article html file updated | 3 May 2019 10:16 CEST | Update | - |
| article html file updated | 27 March 2019 17:40 CET | Update | - |
| article html file updated | 1 September 2017 08:27 CEST | Update | - |
| article html file updated | 26 July 2017 16:09 CEST | Original file | - |
| article xml uploaded. | 26 July 2017 16:08 CEST | Original file | https://www.mdpi.com/2304-8158/6/8/57/xml |
| article pdf uploaded. | 26 July 2017 16:08 CEST | Updated version of record | https://www.mdpi.com/2304-8158/6/8/57/pdf |
