| article html file updated | 8 February 2020 22:43 CET | Update | https://www.mdpi.com/2306-5710/3/4/57 |
| article html file updated | 28 September 2019 21:13 CEST | Update | - |
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| article xml uploaded. | 1 December 2017 07:35 CET | Original file | https://www.mdpi.com/2306-5710/3/4/57/xml |
| article pdf uploaded. | 1 December 2017 07:35 CET | Version of Record | https://www.mdpi.com/2306-5710/3/4/57/pdf |
