| article html file updated | 8 February 2020 22:17 CET | Update | https://www.mdpi.com/2076-3921/6/4/97 |
| article html file updated | 28 September 2019 18:32 CEST | Update | N/A |
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| article html file updated | 26 November 2017 09:13 CET | Original file | N/A |
| article xml uploaded. | 26 November 2017 09:12 CET | Original file | https://www.mdpi.com/2076-3921/6/4/97/xml |
| article pdf uploaded. | 26 November 2017 09:12 CET | Version of Record | https://www.mdpi.com/2076-3921/6/4/97/pdf |
