| article html file updated | 7 February 2020 18:58 CET | Update | https://www.mdpi.com/2073-431X/5/4/31 |
| article html file updated | 4 May 2019 20:36 CEST | Update | - |
| article html file updated | 28 December 2016 08:32 CET | Update | - |
| article html file updated | 2 December 2016 08:18 CET | Original file | - |
| article xml uploaded. | 2 December 2016 08:16 CET | Update | https://www.mdpi.com/2073-431X/5/4/31/xml |
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| article pdf uploaded. | 2 December 2016 08:16 CET | Version of Record | https://www.mdpi.com/2073-431X/5/4/31/pdf |
