| article html file updated | 7 February 2020 21:06 CET | Update | https://www.mdpi.com/2077-1444/8/1/9 |
| article html file updated | 4 May 2019 16:07 CEST | Update | - |
| article html file updated | 7 February 2017 03:33 CET | Update | - |
| article html file updated | 10 January 2017 11:06 CET | Update | - |
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| article xml uploaded. | 10 January 2017 11:04 CET | Original file | https://www.mdpi.com/2077-1444/8/1/9/xml |
| article pdf uploaded. | 10 January 2017 11:04 CET | Version of Record | https://www.mdpi.com/2077-1444/8/1/9/pdf |
