| article html file updated | 6 February 2020 05:38 CET | Update | https://www.mdpi.com/2073-431X/2/4/176 |
| article html file updated | 7 May 2019 21:56 CEST | Update | N/A |
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| article html file updated | 19 December 2016 11:32 CET | Original file | N/A |
| article pdf uploaded. | 20 November 2013 18:49 CET | Updated version of record | https://www.mdpi.com/2073-431X/2/4/176/pdf |
| article pdf uploaded. | 20 November 2013 18:49 CET | Updated version of record | N/A |
| article pdf uploaded. | 19 November 2013 14:48 CET | Version of Record | N/A |
