| article html file updated | 7 February 2020 18:57 CET | Update | https://www.mdpi.com/2218-6581/5/4/26 |
| article html file updated | 22 September 2019 08:18 CEST | Update | - |
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| article html file updated | 30 December 2016 06:08 CET | Update | - |
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| article xml uploaded. | 2 December 2016 08:15 CET | Original file | https://www.mdpi.com/2218-6581/5/4/26/xml |
| article pdf uploaded. | 2 December 2016 08:15 CET | Version of Record | https://www.mdpi.com/2218-6581/5/4/26/pdf |
