| article html file updated | 9 February 2020 04:03 CET | Update | https://www.mdpi.com/2227-7382/6/1/4 |
| article html file updated | 2 May 2019 00:09 CEST | Update | - |
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| article html file updated | 27 March 2018 14:59 CEST | Update | - |
| article pdf uploaded. | 24 January 2018 04:17 CET | Updated version of record | https://www.mdpi.com/2227-7382/6/1/4/pdf |
| article html file updated | 23 January 2018 17:25 CET | Original file | - |
| article xml uploaded. | 23 January 2018 17:23 CET | Original file | https://www.mdpi.com/2227-7382/6/1/4/xml |
| article pdf uploaded. | 23 January 2018 17:23 CET | Version of Record | https://www.mdpi.com/2227-7382/6/1/4/pdf-vor |
