| article html file updated | 9 February 2020 02:27 CET | Update | https://www.mdpi.com/2079-6439/6/1/4 |
| article html file updated | 29 September 2019 18:44 CEST | Update | N/A |
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| article html file updated | 9 January 2018 13:49 CET | Original file | N/A |
| article xml uploaded. | 9 January 2018 13:47 CET | Update | https://www.mdpi.com/2079-6439/6/1/4/xml |
| article pdf uploaded. | 9 January 2018 13:47 CET | Version of Record | https://www.mdpi.com/2079-6439/6/1/4/pdf |