| article html file updated | 8 February 2020 07:04 CET | Update | https://www.mdpi.com/2227-7102/7/2/57 |
| article html file updated | 25 September 2019 02:13 CEST | Update | - |
| article html file updated | 3 May 2019 19:44 CEST | Update | - |
| article html file updated | 27 October 2017 09:58 CEST | Update | - |
| article html file updated | 2 June 2017 14:47 CEST | Original file | - |
| article xml uploaded. | 2 June 2017 14:46 CEST | Original file | https://www.mdpi.com/2227-7102/7/2/57/xml |
| article pdf uploaded. | 2 June 2017 14:46 CEST | Updated version of record | https://www.mdpi.com/2227-7102/7/2/57/pdf |
| article pdf uploaded. | 31 May 2017 11:04 CEST | Version of Record | https://www.mdpi.com/2227-7102/7/2/57/pdf-vor |
