| article html file updated | 8 February 2020 23:45 CET | Update | https://www.mdpi.com/2079-6374/7/4/60 |
| article html file updated | 29 September 2019 03:13 CEST | Update | - |
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| article html file updated | 2 January 2018 12:23 CET | Update | - |
| article html file updated | 11 December 2017 14:27 CET | Original file | - |
| article xml uploaded. | 11 December 2017 14:26 CET | Original file | https://www.mdpi.com/2079-6374/7/4/60/xml |
| article pdf uploaded. | 11 December 2017 14:26 CET | Version of Record | https://www.mdpi.com/2079-6374/7/4/60/pdf |
