| article html file updated | 9 February 2020 01:18 CET | Update | https://www.mdpi.com/2312-7481/4/1/4 |
| article html file updated | 29 September 2019 12:14 CEST | Update | N/A |
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| article html file updated | 27 December 2017 06:47 CET | Original file | N/A |
| article xml uploaded. | 27 December 2017 06:46 CET | Update | https://www.mdpi.com/2312-7481/4/1/4/xml |
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| article pdf uploaded. | 27 December 2017 06:46 CET | Version of Record | https://www.mdpi.com/2312-7481/4/1/4/pdf |
