| article html file updated | 8 February 2020 03:35 CET | Update | https://www.mdpi.com/2218-1989/7/2/15 |
| article html file updated | 24 September 2019 07:42 CEST | Update | - |
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| article html file updated | 28 June 2017 13:51 CEST | Update | - |
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| article xml uploaded. | 14 April 2017 11:34 CEST | Original file | https://www.mdpi.com/2218-1989/7/2/15/xml |
| article pdf uploaded. | 14 April 2017 11:34 CEST | Version of Record | https://www.mdpi.com/2218-1989/7/2/15/pdf |
