| article html file updated | 6 February 2020 04:19 CET | Update | https://www.mdpi.com/2227-9040/1/2/3 |
| article html file updated | 8 May 2019 00:35 CEST | Update | - |
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| article html file updated | 29 October 2013 17:59 CET | Original file | - |
| article xml uploaded. | 29 October 2013 17:59 CET | Original file | https://www.mdpi.com/2227-9040/1/2/3/xml |
| article pdf uploaded. | 11 September 2013 14:54 CEST | Version of Record | https://www.mdpi.com/2227-9040/1/2/3/pdf |
