| article html file updated | 7 February 2020 07:42 CET | Update | https://www.mdpi.com/2218-1989/6/2/12 |
| article html file updated | 5 May 2019 17:45 CEST | Update | N/A |
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| article html file updated | 23 April 2016 11:56 CEST | Original file | N/A |
| article pdf uploaded. | 23 April 2016 05:30 CEST | Updated version of record | https://www.mdpi.com/2218-1989/6/2/12/pdf |
