| article html file updated | 9 February 2020 03:24 CET | Update | https://www.mdpi.com/2075-4663/6/1/4 |
| article html file updated | 30 September 2019 00:06 CEST | Update | - |
| article html file updated | 2 May 2019 01:34 CEST | Update | - |
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| article html file updated | 27 March 2018 15:45 CEST | Update | - |
| article html file updated | 17 January 2018 15:50 CET | Original file | - |
| article xml uploaded. | 17 January 2018 15:49 CET | Original file | https://www.mdpi.com/2075-4663/6/1/4/xml |
| article pdf uploaded. | 17 January 2018 15:49 CET | Version of Record | https://www.mdpi.com/2075-4663/6/1/4/pdf |
