| article html file updated | 7 February 2020 02:03 CET | Update | https://www.mdpi.com/2077-1312/3/4/1544 |
| article html file updated | 6 May 2019 05:21 CEST | Update | - |
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| article html file updated | 9 November 2017 10:27 CET | Original file | - |
| article pdf uploaded. | 10 December 2015 13:16 CET | Version of Record | https://www.mdpi.com/2077-1312/3/4/1544/pdf |
| article xml uploaded. | 10 December 2015 13:16 CET | Original file | https://www.mdpi.com/2077-1312/3/4/1544/xml |
