| article html file updated | 9 February 2020 05:15 CET | Update | https://www.mdpi.com/2076-3271/6/1/9 |
| article html file updated | 1 May 2019 21:36 CEST | Update | N/A |
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| article xml uploaded. | 2 February 2018 06:53 CET | Update | https://www.mdpi.com/2076-3271/6/1/9/xml |
| article xml uploaded. | 2 February 2018 03:06 CET | Original file | N/A |
| article pdf uploaded. | 2 February 2018 03:06 CET | Version of Record | https://www.mdpi.com/2076-3271/6/1/9/pdf |