| article html file updated | 9 February 2020 01:51 CET | Update | https://www.mdpi.com/2218-1997/4/1/8 |
| article html file updated | 2 May 2019 04:43 CEST | Update | - |
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| article html file updated | 1 February 2018 11:49 CET | Update | - |
| article html file updated | 3 January 2018 09:38 CET | Original file | - |
| article xml uploaded. | 3 January 2018 09:36 CET | Original file | https://www.mdpi.com/2218-1997/4/1/8/xml |
| article pdf uploaded. | 3 January 2018 09:36 CET | Version of Record | https://www.mdpi.com/2218-1997/4/1/8/pdf |
