| article html file updated | 7 February 2020 09:47 CET | Update | https://www.mdpi.com/2218-1989/6/2/18 |
| article html file updated | 5 May 2019 13:40 CEST | Update | - |
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| article html file updated | 4 July 2016 06:20 CEST | Update | - |
| article html file updated | 6 June 2016 08:34 CEST | Original file | - |
| article xml uploaded. | 6 June 2016 08:33 CEST | Original file | https://www.mdpi.com/2218-1989/6/2/18/xml |
| article pdf uploaded. | 6 June 2016 08:33 CEST | Version of Record | https://www.mdpi.com/2218-1989/6/2/18/pdf |
