| article html file updated | 9 February 2020 04:04 CET | Update | https://www.mdpi.com/1996-1073/11/2/271 |
| article html file updated | 30 September 2019 03:52 CEST | Update | N/A |
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| article html file updated | 23 January 2018 15:25 CET | Original file | N/A |
| article xml uploaded. | 23 January 2018 15:24 CET | Original file | https://www.mdpi.com/1996-1073/11/2/271/xml |
| article pdf uploaded. | 23 January 2018 15:24 CET | Version of Record | https://www.mdpi.com/1996-1073/11/2/271/pdf |
