| article html file updated | 11 February 2020 01:45 CET | Update | https://www.mdpi.com/2411-5134/3/4/80 | 
| article html file updated | 11 October 2019 14:33 CEST | Update | - | 
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| article html file updated | 7 December 2018 08:09 CET | Original file | - | 
| article pdf uploaded. | 7 December 2018 08:08 CET | Version of Record | https://www.mdpi.com/2411-5134/3/4/80/pdf | 
| article xml uploaded. | 7 December 2018 08:08 CET | Update | https://www.mdpi.com/2411-5134/3/4/80/xml | 
| article xml file uploaded | 7 December 2018 08:08 CET | Original file | - |