| article html file updated | 9 February 2020 00:56 CET | Update | https://www.mdpi.com/1996-1073/11/1/21 |
| article html file updated | 29 September 2019 10:13 CEST | Update | N/A |
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| article html file updated | 22 December 2017 14:18 CET | Original file | N/A |
| article xml uploaded. | 22 December 2017 14:17 CET | Original file | https://www.mdpi.com/1996-1073/11/1/21/xml |
| article pdf uploaded. | 22 December 2017 14:17 CET | Version of Record | https://www.mdpi.com/1996-1073/11/1/21/pdf |
