| article html file updated | 7 February 2020 06:41 CET | Update | https://www.mdpi.com/2075-4698/6/2/8 |
| article html file updated | 21 September 2019 14:18 CEST | Update | - |
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| article html file updated | 1 July 2016 12:50 CEST | Update | - |
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| article xml uploaded. | 31 March 2016 12:20 CEST | Original file | https://www.mdpi.com/2075-4698/6/2/8/xml |
| article pdf uploaded. | 31 March 2016 12:20 CEST | Version of Record | https://www.mdpi.com/2075-4698/6/2/8/pdf |
