| article html file updated | 9 February 2020 01:00 CET | Update | https://www.mdpi.com/2311-5521/3/1/2 |
| article html file updated | 2 May 2019 06:33 CEST | Update | - |
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| article xml uploaded. | 23 December 2017 09:36 CET | Update | https://www.mdpi.com/2311-5521/3/1/2/xml |
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| article pdf uploaded. | 23 December 2017 09:36 CET | Version of Record | https://www.mdpi.com/2311-5521/3/1/2/pdf |