| article html file updated | 7 February 2020 21:49 CET | Update | https://www.mdpi.com/2073-4441/9/1/61 |
| article html file updated | 22 September 2019 23:17 CEST | Update | - |
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| article html file updated | 7 February 2017 04:34 CET | Update | - |
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| article xml uploaded. | 19 January 2017 11:30 CET | Original file | https://www.mdpi.com/2073-4441/9/1/61/xml |
| article pdf uploaded. | 19 January 2017 11:30 CET | Version of Record | https://www.mdpi.com/2073-4441/9/1/61/pdf |
