| article html file updated | 9 February 2020 01:12 CET | Update | https://www.mdpi.com/1996-1073/11/1/42 |
| article html file updated | 29 September 2019 11:41 CEST | Update | - |
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| article html file updated | 25 December 2017 14:53 CET | Original file | - |
| article xml uploaded. | 25 December 2017 14:51 CET | Original file | https://www.mdpi.com/1996-1073/11/1/42/xml |
| article pdf uploaded. | 25 December 2017 14:51 CET | Version of Record | https://www.mdpi.com/1996-1073/11/1/42/pdf |
