| article html file updated | 7 February 2020 08:39 CET | Update | https://www.mdpi.com/1999-5903/8/2/21 |
| article html file updated | 5 May 2019 15:53 CEST | Update | - |
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| article html file updated | 16 May 2016 23:08 CEST | Original file | - |
| article xml uploaded. | 13 May 2016 15:55 CEST | Original file | https://www.mdpi.com/1999-5903/8/2/21/xml |
| article pdf uploaded. | 13 May 2016 15:55 CEST | Version of Record | https://www.mdpi.com/1999-5903/8/2/21/pdf |
