| article html file updated | 8 February 2020 03:04 CET | Update | https://www.mdpi.com/2218-6581/6/2/8 |
| article html file updated | 24 September 2019 04:59 CEST | Update | - |
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| article html file updated | 29 June 2017 12:23 CEST | Update | - |
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| article xml uploaded. | 7 April 2017 13:18 CEST | Update | https://www.mdpi.com/2218-6581/6/2/8/xml |
| article pdf uploaded. | 7 April 2017 13:18 CEST | Version of Record | https://www.mdpi.com/2218-6581/6/2/8/pdf |
