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| article pdf uploaded. | 31 January 2019 06:04 CET | Updated version of record | https://www.mdpi.com/2220-9964/8/2/68/pdf |
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| article html file updated | 30 January 2019 12:30 CET | Original file | N/A |
| article pdf uploaded. | 30 January 2019 12:27 CET | Version of Record | https://www.mdpi.com/2220-9964/8/2/68/pdf-vor |
| article xml uploaded. | 30 January 2019 12:27 CET | Update | N/A |
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