| article html file updated | 9 February 2020 01:38 CET | Update | https://www.mdpi.com/2304-8158/7/1/2 |
| article html file updated | 29 September 2019 14:14 CEST | Update | N/A |
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| article pdf uploaded. | 1 January 2018 07:04 CET | Version of Record | https://www.mdpi.com/2304-8158/7/1/2/pdf |
