| article html file updated | 8 February 2020 17:34 CET | Update | https://www.mdpi.com/2076-3921/6/4/76 |
| article html file updated | 27 September 2019 11:37 CEST | Update | - |
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| article html file updated | 2 January 2018 20:31 CET | Update | - |
| article pdf uploaded. | 3 October 2017 16:25 CEST | Version of Record | https://www.mdpi.com/2076-3921/6/4/76/pdf |
| article html file updated | 30 September 2017 15:57 CEST | Original file | - |
| article xml uploaded. | 30 September 2017 10:43 CEST | Original file | https://www.mdpi.com/2076-3921/6/4/76/xml |
