| article html file updated | 9 February 2020 04:43 CET | Update | https://www.mdpi.com/2075-4663/6/1/9 |
| article html file updated | 30 September 2019 07:44 CEST | Update | - |
| article html file updated | 1 May 2019 22:46 CEST | Update | - |
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| article html file updated | 27 March 2018 15:47 CEST | Update | - |
| article html file updated | 29 January 2018 11:31 CET | Original file | - |
| article xml uploaded. | 29 January 2018 11:29 CET | Original file | https://www.mdpi.com/2075-4663/6/1/9/xml |
| article pdf uploaded. | 29 January 2018 11:29 CET | Version of Record | https://www.mdpi.com/2075-4663/6/1/9/pdf |
