| article html file updated | 7 February 2020 20:21 CET | Update | https://www.mdpi.com/2071-1050/9/1/33 |
| article html file updated | 22 September 2019 15:30 CEST | Update | - |
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| article html file updated | 7 February 2017 09:44 CET | Update | - |
| article html file updated | 27 December 2016 10:36 CET | Original file | - |
| article xml uploaded. | 27 December 2016 10:35 CET | Original file | https://www.mdpi.com/2071-1050/9/1/33/xml |
| article pdf uploaded. | 27 December 2016 10:35 CET | Version of Record | https://www.mdpi.com/2071-1050/9/1/33/pdf |
