| article html file updated | 9 February 2020 00:58 CET | Update | https://www.mdpi.com/2227-7390/6/1/2 |
| article html file updated | 29 September 2019 10:24 CEST | Update | - |
| article html file updated | 2 May 2019 06:39 CEST | Update | - |
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| article html file updated | 1 February 2018 09:24 CET | Update | - |
| article html file updated | 24 December 2017 14:21 CET | Original file | - |
| article xml uploaded. | 24 December 2017 14:20 CET | Original file | https://www.mdpi.com/2227-7390/6/1/2/xml |
| article pdf uploaded. | 24 December 2017 14:20 CET | Updated version of record | https://www.mdpi.com/2227-7390/6/1/2/pdf |
| article pdf uploaded. | 22 December 2017 16:24 CET | Version of Record | https://www.mdpi.com/2227-7390/6/1/2/pdf-vor |
