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| article pdf uploaded. | 1 February 2019 11:11 CET | Updated version of record | https://www.mdpi.com/2227-9717/7/2/67/pdf |
| article xml uploaded. | 1 February 2019 11:11 CET | Update | https://www.mdpi.com/2227-9717/7/2/67/xml |
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| article html file updated | 30 January 2019 13:03 CET | Original file | N/A |
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| article xml uploaded. | 30 January 2019 13:01 CET | Update | N/A |
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