| article html file updated | 7 February 2020 06:28 CET | Update | https://www.mdpi.com/1996-1073/9/4/244 |
| article html file updated | 5 May 2019 20:17 CEST | Update | - |
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| article html file updated | 28 April 2016 07:50 CEST | Update | - |
| article html file updated | 26 March 2016 14:09 CET | Original file | - |
| article xml uploaded. | 26 March 2016 14:08 CET | Original file | https://www.mdpi.com/1996-1073/9/4/244/xml |
| article pdf uploaded. | 26 March 2016 14:08 CET | Version of Record | https://www.mdpi.com/1996-1073/9/4/244/pdf |
