| article html file updated | 7 February 2020 00:53 CET | Original file | https://www.mdpi.com/2076-3417/5/4/1117 |
| article pdf uploaded. | 16 November 2015 10:37 CET | Updated version of record | https://www.mdpi.com/2076-3417/5/4/1117/pdf |
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