| article html file updated | 9 February 2020 10:48 CET | Update | https://www.mdpi.com/2076-0787/7/2/30 |
| article html file updated | 1 May 2019 09:40 CEST | Update | - |
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| article html file updated | 22 March 2018 13:17 CET | Original file | - |
| article xml uploaded. | 22 March 2018 13:16 CET | Original file | https://www.mdpi.com/2076-0787/7/2/30/xml |
| article pdf uploaded. | 22 March 2018 13:16 CET | Version of Record | https://www.mdpi.com/2076-0787/7/2/30/pdf |
