| article html file updated | 6 February 2020 01:46 CET | Update | https://www.mdpi.com/2076-393X/1/2/139 |
| article html file updated | 19 September 2019 20:04 CEST | Update | - |
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| article xml file uploaded | 2 July 2015 06:38 CEST | Update | https://www.mdpi.com/2076-393X/1/2/139/xml |
| article html file updated | 17 June 2015 08:48 CEST | Update | - |
| article html file updated | 16 December 2014 04:58 CET | Original file | - |
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| article pdf uploaded. | 25 April 2013 15:37 CEST | Version of Record | https://www.mdpi.com/2076-393X/1/2/139/pdf |