| article html file updated | 7 February 2020 18:43 CET | Update | https://www.mdpi.com/2076-3921/5/4/43 |
| article html file updated | 22 September 2019 07:23 CEST | Update | - |
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| article html file updated | 27 December 2016 11:55 CET | Update | - |
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| article xml uploaded. | 29 November 2016 04:02 CET | Original file | https://www.mdpi.com/2076-3921/5/4/43/xml |
| article pdf uploaded. | 29 November 2016 04:02 CET | Version of Record | https://www.mdpi.com/2076-3921/5/4/43/pdf |
