| article html file updated | 8 February 2020 07:04 CET | Update | https://www.mdpi.com/2221-3759/5/2/6 |
| article html file updated | 25 September 2019 02:12 CEST | Update | - |
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| article pdf uploaded. | 31 May 2017 10:26 CEST | Version of Record | https://www.mdpi.com/2221-3759/5/2/6/pdf |
