| article html file updated | 9 February 2020 00:12 CET | Update | https://www.mdpi.com/2077-0375/7/4/69 |
| article html file updated | 29 September 2019 06:00 CEST | Update | N/A |
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| article html file updated | 2 January 2018 20:23 CET | Update | N/A |
| article html file updated | 15 December 2017 16:34 CET | Original file | N/A |
| article xml uploaded. | 15 December 2017 16:33 CET | Original file | https://www.mdpi.com/2077-0375/7/4/69/xml |
| article pdf uploaded. | 15 December 2017 16:33 CET | Version of Record | https://www.mdpi.com/2077-0375/7/4/69/pdf |
