| article html file updated | 9 February 2020 01:40 CET | Update | https://www.mdpi.com/1996-1073/11/1/60 |
| article html file updated | 29 September 2019 14:23 CEST | Update | - |
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| article xml uploaded. | 1 January 2018 07:34 CET | Update | https://www.mdpi.com/1996-1073/11/1/60/xml |
| article pdf uploaded. | 1 January 2018 07:34 CET | Version of Record | https://www.mdpi.com/1996-1073/11/1/60/pdf |
