| article html file updated | 8 February 2020 21:21 CET | Update | https://www.mdpi.com/1424-2818/9/4/52 |
| article html file updated | 28 September 2019 12:33 CEST | Update | - |
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| article html file updated | 21 November 2017 06:55 CET | Update | - |
| article xml uploaded. | 21 November 2017 06:54 CET | Update | https://www.mdpi.com/1424-2818/9/4/52/xml |
| article pdf uploaded. | 21 November 2017 06:54 CET | Updated version of record | https://www.mdpi.com/1424-2818/9/4/52/pdf |
| article html file updated | 16 November 2017 12:29 CET | Original file | - |
| article xml uploaded. | 16 November 2017 12:27 CET | Original file | - |
| article pdf uploaded. | 16 November 2017 12:27 CET | Version of Record | https://www.mdpi.com/1424-2818/9/4/52/pdf-vor |
