| article html file updated | 8 February 2020 22:54 CET | Update | https://www.mdpi.com/2224-2708/6/4/29 |
| article html file updated | 28 September 2019 22:22 CEST | Update | - |
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| article html file updated | 2 December 2017 07:43 CET | Original file | - |
| article xml uploaded. | 2 December 2017 07:42 CET | Original file | https://www.mdpi.com/2224-2708/6/4/29/xml |
| article pdf uploaded. | 2 December 2017 07:42 CET | Version of Record | https://www.mdpi.com/2224-2708/6/4/29/pdf |
