| article html file updated | 8 February 2020 22:27 CET | Update | https://www.mdpi.com/1999-5903/9/4/87 |
| article html file updated | 28 September 2019 19:33 CEST | Update | - |
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| article html file updated | 2 January 2018 11:20 CET | Update | - |
| article html file updated | 28 November 2017 11:31 CET | Original file | - |
| article xml uploaded. | 28 November 2017 11:30 CET | Original file | https://www.mdpi.com/1999-5903/9/4/87/xml |
| article pdf uploaded. | 28 November 2017 11:30 CET | Version of Record | https://www.mdpi.com/1999-5903/9/4/87/pdf |
