| article html file updated | 9 February 2020 01:22 CET | Update | https://www.mdpi.com/2411-5142/3/1/4 |
| article html file updated | 2 May 2019 05:45 CEST | Update | - |
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| article html file updated | 28 March 2019 11:36 CET | Update | - |
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| article xml uploaded. | 28 December 2017 07:49 CET | Original file | https://www.mdpi.com/2411-5142/3/1/4/xml |
| article pdf uploaded. | 28 December 2017 07:49 CET | Version of Record | https://www.mdpi.com/2411-5142/3/1/4/pdf |
