| article html file updated | 9 February 2020 00:53 CET | Update | https://www.mdpi.com/2075-4701/8/1/4 |
| article html file updated | 29 September 2019 09:54 CEST | Update | - |
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| article html file updated | 22 December 2017 10:27 CET | Original file | - |
| article xml uploaded. | 22 December 2017 10:26 CET | Update | https://www.mdpi.com/2075-4701/8/1/4/xml |
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| article pdf uploaded. | 22 December 2017 10:26 CET | Version of Record | https://www.mdpi.com/2075-4701/8/1/4/pdf |
