| article html file updated | 7 February 2020 20:58 CET | Update | https://www.mdpi.com/2075-4701/7/1/15 |
| article html file updated | 22 September 2019 18:53 CEST | Update | - |
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| article html file updated | 7 February 2017 09:32 CET | Update | - |
| article html file updated | 7 January 2017 06:03 CET | Original file | - |
| article xml uploaded. | 7 January 2017 06:02 CET | Original file | https://www.mdpi.com/2075-4701/7/1/15/xml |
| article pdf uploaded. | 7 January 2017 06:02 CET | Version of Record | https://www.mdpi.com/2075-4701/7/1/15/pdf |
