| article html file updated | 7 February 2020 23:24 CET | Update | https://www.mdpi.com/2076-0825/6/1/9 |
| article html file updated | 23 September 2019 07:59 CEST | Update | - |
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| article html file updated | 29 March 2017 10:33 CEST | Update | - |
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| article xml uploaded. | 15 February 2017 03:43 CET | Original file | https://www.mdpi.com/2076-0825/6/1/9/xml |
| article pdf uploaded. | 15 February 2017 03:43 CET | Version of Record | https://www.mdpi.com/2076-0825/6/1/9/pdf |
