| article html file updated | 31 August 2025 09:38 CEST | Update | https://www.mdpi.com/2220-9964/9/2/68 | 
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| article pdf uploaded. | 12 February 2020 13:38 CET | Updated version of record | https://www.mdpi.com/2220-9964/9/2/68/pdf | 
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| article pdf uploaded. | 7 February 2020 11:49 CET | Updated version of record | https://www.mdpi.com/2220-9964/9/2/68/pdf-vor | 
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| article pdf uploaded. | 21 January 2020 16:08 CET | Version of Record | https://www.mdpi.com/2220-9964/9/2/68/pdf-vor | 
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