| article html file updated | 9 February 2020 04:10 CET | Update | https://www.mdpi.com/2076-3417/8/2/159 | 
| article html file updated | 30 September 2019 04:26 CEST | Update | - | 
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| article html file updated | 14 March 2018 09:47 CET | Update | - | 
| article html file updated | 24 January 2018 10:03 CET | Update | - | 
| article xml uploaded. | 24 January 2018 10:02 CET | Update | https://www.mdpi.com/2076-3417/8/2/159/xml | 
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| article pdf uploaded. | 24 January 2018 10:02 CET | Version of Record | https://www.mdpi.com/2076-3417/8/2/159/pdf | 
| article html file updated | 24 January 2018 09:59 CET | Original file | - | 
| article xml uploaded. | 24 January 2018 09:57 CET | Original file | - |