| article html file updated | 6 February 2020 01:20 CET | Update | https://www.mdpi.com/2076-328X/3/2/192 |
| article html file updated | 19 September 2019 19:22 CEST | Update | N/A |
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| article html file updated | 8 May 2014 15:47 CEST | Original file | N/A |
| article pdf uploaded. | 2 April 2013 14:36 CEST | Version of Record | https://www.mdpi.com/2076-328X/3/2/192/pdf |