| article html file updated | 7 February 2020 18:04 CET | Update | https://www.mdpi.com/2075-4418/6/4/39 |
| article html file updated | 22 September 2019 05:44 CEST | Update | - |
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| article html file updated | 28 December 2016 11:46 CET | Update | - |
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| article xml uploaded. | 16 November 2016 09:28 CET | Original file | https://www.mdpi.com/2075-4418/6/4/39/xml |
| article pdf uploaded. | 16 November 2016 09:28 CET | Version of Record | https://www.mdpi.com/2075-4418/6/4/39/pdf |
