| article html file updated | 8 February 2020 07:50 CET | Update | https://www.mdpi.com/1999-5903/9/2/21 |
| article html file updated | 25 September 2019 06:10 CEST | Update | - |
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| article html file updated | 30 June 2017 11:28 CEST | Update | - |
| article html file updated | 9 June 2017 05:41 CEST | Original file | - |
| article xml uploaded. | 9 June 2017 05:40 CEST | Original file | https://www.mdpi.com/1999-5903/9/2/21/xml |
| article pdf uploaded. | 9 June 2017 05:40 CEST | Version of Record | https://www.mdpi.com/1999-5903/9/2/21/pdf |
