| article html file updated | 9 February 2020 00:36 CET | Update | https://www.mdpi.com/2221-3759/5/4/18 |
| article html file updated | 29 September 2019 08:19 CEST | Update | - |
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| article html file updated | 19 December 2017 16:41 CET | Original file | - |
| article xml uploaded. | 19 December 2017 16:39 CET | Update | https://www.mdpi.com/2221-3759/5/4/18/xml |
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| article pdf uploaded. | 19 December 2017 16:39 CET | Version of Record | https://www.mdpi.com/2221-3759/5/4/18/pdf |