| article html file updated | 7 February 2020 16:35 CET | Update | https://www.mdpi.com/2218-273X/6/4/40 |
| article html file updated | 22 September 2019 03:19 CEST | Update | - |
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| article html file updated | 29 December 2016 04:28 CET | Update | - |
| article html file updated | 18 October 2016 13:16 CEST | Original file | - |
| article xml uploaded. | 18 October 2016 13:15 CEST | Original file | https://www.mdpi.com/2218-273X/6/4/40/xml |
| article pdf uploaded. | 18 October 2016 13:15 CEST | Version of Record | https://www.mdpi.com/2218-273X/6/4/40/pdf |
