| article html file updated | 8 February 2020 23:43 CET | Update | https://www.mdpi.com/2226-4787/5/4/67 |
| article html file updated | 29 September 2019 03:02 CEST | Update | - |
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| article html file updated | 11 December 2017 16:45 CET | Original file | - |
| article xml uploaded. | 11 December 2017 16:44 CET | Original file | https://www.mdpi.com/2226-4787/5/4/67/xml |
| article pdf uploaded. | 11 December 2017 16:44 CET | Version of Record | https://www.mdpi.com/2226-4787/5/4/67/pdf |
