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| article html file updated | 6 December 2018 11:03 CET | Original file | N/A |
| article pdf uploaded. | 6 December 2018 11:01 CET | Updated version of record | https://www.mdpi.com/2224-2708/7/4/50/pdf |
| article xml uploaded. | 6 December 2018 11:01 CET | Update | https://www.mdpi.com/2224-2708/7/4/50/xml |
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| article pdf uploaded. | 23 November 2018 16:49 CET | Updated version of record | https://www.mdpi.com/2224-2708/7/4/50/pdf-vor |
| article pdf uploaded. | 23 November 2018 16:43 CET | Version of Record | https://www.mdpi.com/2224-2708/7/4/50/pdf-vor |
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