| article html file updated | 7 February 2020 21:26 CET | Update | https://www.mdpi.com/2079-6382/6/1/2 |
| article html file updated | 22 September 2019 21:13 CEST | Update | - |
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| article html file updated | 29 March 2017 07:47 CEST | Update | - |
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| article xml uploaded. | 13 January 2017 11:53 CET | Original file | https://www.mdpi.com/2079-6382/6/1/2/xml |
| article pdf uploaded. | 13 January 2017 11:53 CET | Version of Record | https://www.mdpi.com/2079-6382/6/1/2/pdf |
