| article html file updated | 8 February 2020 08:38 CET | Update | https://www.mdpi.com/2072-6694/9/6/68 |
| article html file updated | 25 September 2019 10:16 CEST | Update | - |
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| article html file updated | 27 June 2017 09:56 CEST | Update | - |
| article html file updated | 18 June 2017 22:33 CEST | Original file | - |
| article xml uploaded. | 18 June 2017 11:46 CEST | Original file | https://www.mdpi.com/2072-6694/9/6/68/xml |
| article pdf uploaded. | 18 June 2017 11:46 CEST | Version of Record | https://www.mdpi.com/2072-6694/9/6/68/pdf |
