| article html file updated | 9 February 2020 10:37 CET | Update | https://www.mdpi.com/1422-0067/19/4/931 | 
| article html file updated | 1 October 2019 19:47 CEST | Update | - | 
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| article html file updated | 21 March 2018 09:38 CET | Original file | - | 
| article xml uploaded. | 21 March 2018 09:37 CET | Original file | https://www.mdpi.com/1422-0067/19/4/931/xml | 
| article pdf uploaded. | 21 March 2018 09:37 CET | Version of Record | https://www.mdpi.com/1422-0067/19/4/931/pdf |