| article html file updated | 8 February 2020 20:29 CET | Update | https://www.mdpi.com/2227-9717/5/4/68 |
| article html file updated | 28 September 2019 06:48 CEST | Update | - |
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| article html file updated | 2 January 2018 11:52 CET | Update | - |
| article html file updated | 6 November 2017 14:23 CET | Original file | - |
| article xml uploaded. | 6 November 2017 14:22 CET | Original file | https://www.mdpi.com/2227-9717/5/4/68/xml |
| article pdf uploaded. | 6 November 2017 14:22 CET | Version of Record | https://www.mdpi.com/2227-9717/5/4/68/pdf |
