| article html file updated | 8 February 2020 02:15 CET | Update | https://www.mdpi.com/2071-1050/9/4/494 |
| article html file updated | 24 September 2019 00:17 CEST | Update | N/A |
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| article html file updated | 25 March 2017 10:58 CET | Original file | N/A |
| article xml uploaded. | 25 March 2017 10:57 CET | Original file | https://www.mdpi.com/2071-1050/9/4/494/xml |
| article pdf uploaded. | 25 March 2017 10:57 CET | Version of Record | https://www.mdpi.com/2071-1050/9/4/494/pdf |