| article html file updated | 8 February 2020 05:29 CET | Update | https://www.mdpi.com/2075-5309/7/2/39 |
| article html file updated | 24 September 2019 17:56 CEST | Update | - |
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| article xml uploaded. | 26 October 2017 04:57 CEST | Update | https://www.mdpi.com/2075-5309/7/2/39/xml |
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| article pdf uploaded. | 24 October 2017 08:55 CEST | Updated version of record | https://www.mdpi.com/2075-5309/7/2/39/pdf |
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