| article html file updated | 8 February 2020 02:11 CET | Update | https://www.mdpi.com/1420-3049/22/4/520 | 
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| article xml uploaded. | 24 March 2017 12:20 CET | Update | https://www.mdpi.com/1420-3049/22/4/520/xml | 
| article pdf uploaded. | 24 March 2017 12:20 CET | Version of Record | https://www.mdpi.com/1420-3049/22/4/520/pdf |