| article html file updated | 9 February 2020 00:28 CET | Update | https://www.mdpi.com/2218-1989/7/4/64 |
| article html file updated | 29 September 2019 07:29 CEST | Update | - |
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| article html file updated | 18 December 2017 16:21 CET | Original file | - |
| article xml uploaded. | 18 December 2017 16:20 CET | Original file | https://www.mdpi.com/2218-1989/7/4/64/xml |
| article pdf uploaded. | 18 December 2017 16:20 CET | Version of Record | https://www.mdpi.com/2218-1989/7/4/64/pdf |
