| article html file updated | 8 February 2020 20:04 CET | Update | https://www.mdpi.com/1424-2818/9/4/50 |
| article html file updated | 2 May 2019 17:33 CEST | Update | - |
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| article html file updated | 14 December 2017 10:35 CET | Update | - |
| article xml uploaded. | 14 December 2017 10:34 CET | Update | https://www.mdpi.com/1424-2818/9/4/50/xml |
| article pdf uploaded. | 14 December 2017 10:34 CET | Updated version of record | https://www.mdpi.com/1424-2818/9/4/50/pdf |
| article html file updated | 1 November 2017 13:25 CET | Original file | - |
| article xml uploaded. | 1 November 2017 13:24 CET | Original file | - |
| article pdf uploaded. | 1 November 2017 13:24 CET | Version of Record | https://www.mdpi.com/1424-2818/9/4/50/pdf-vor |
