| article html file updated | 9 February 2020 06:28 CET | Update | https://www.mdpi.com/2078-1547/9/1/6 |
| article html file updated | 1 May 2019 18:47 CEST | Update | - |
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| article pdf uploaded. | 14 March 2018 15:05 CET | Updated version of record | https://www.mdpi.com/2078-1547/9/1/6/pdf |
| article html file updated | 13 February 2018 04:32 CET | Original file | - |
| article xml uploaded. | 13 February 2018 04:31 CET | Original file | https://www.mdpi.com/2078-1547/9/1/6/xml |
| article pdf uploaded. | 13 February 2018 04:31 CET | Version of Record | https://www.mdpi.com/2078-1547/9/1/6/pdf-vor |
