| article html file updated | 7 February 2020 22:21 CET | Update | https://www.mdpi.com/2227-9032/5/1/4 |
| article html file updated | 23 September 2019 02:10 CEST | Update | - |
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| article html file updated | 30 March 2017 11:33 CEST | Update | - |
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| article xml uploaded. | 29 January 2017 08:05 CET | Original file | https://www.mdpi.com/2227-9032/5/1/4/xml |
| article pdf uploaded. | 29 January 2017 08:05 CET | Version of Record | https://www.mdpi.com/2227-9032/5/1/4/pdf |
