| article html file updated | 8 February 2020 06:36 CET | Update | https://www.mdpi.com/2218-1989/7/2/22 |
| article html file updated | 24 September 2019 23:46 CEST | Update | - |
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| article html file updated | 28 June 2017 13:52 CEST | Update | - |
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| article xml uploaded. | 24 May 2017 16:50 CEST | Original file | https://www.mdpi.com/2218-1989/7/2/22/xml |
| article pdf uploaded. | 24 May 2017 16:50 CEST | Version of Record | https://www.mdpi.com/2218-1989/7/2/22/pdf |
