| article html file updated | 9 February 2020 05:55 CET | Update | https://www.mdpi.com/2075-4701/8/2/117 | 
| article html file updated | 30 September 2019 15:09 CEST | Update | - | 
| article html file updated | 1 May 2019 20:03 CEST | Update | - | 
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| article html file updated | 28 March 2019 21:48 CET | Update | - | 
| article html file updated | 8 February 2018 09:10 CET | Original file | - | 
| article xml uploaded. | 8 February 2018 09:08 CET | Update | https://www.mdpi.com/2075-4701/8/2/117/xml | 
| article xml uploaded. | 8 February 2018 09:08 CET | Original file | - | 
| article pdf uploaded. | 8 February 2018 09:08 CET | Version of Record | https://www.mdpi.com/2075-4701/8/2/117/pdf |