| article html file updated | 9 February 2020 04:45 CET | Update | https://www.mdpi.com/2079-6412/8/2/52 |
| article html file updated | 30 September 2019 07:55 CEST | Update | - |
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| article html file updated | 29 January 2018 16:13 CET | Original file | - |
| article xml uploaded. | 29 January 2018 16:11 CET | Update | https://www.mdpi.com/2079-6412/8/2/52/xml |
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| article pdf uploaded. | 29 January 2018 16:11 CET | Version of Record | https://www.mdpi.com/2079-6412/8/2/52/pdf |