| article html file updated | 11 February 2020 04:31 CET | Update | https://www.mdpi.com/2076-0752/8/1/2 | 
| article html file updated | 27 April 2019 16:22 CEST | Update | - | 
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| article html file updated | 21 December 2018 07:50 CET | Original file | - | 
| article pdf uploaded. | 21 December 2018 07:49 CET | Version of Record | https://www.mdpi.com/2076-0752/8/1/2/pdf | 
| article xml uploaded. | 21 December 2018 07:49 CET | Update | https://www.mdpi.com/2076-0752/8/1/2/xml | 
| article xml file uploaded | 21 December 2018 07:49 CET | Original file | - |