| article html file updated | 8 February 2020 06:53 CET | Update | https://www.mdpi.com/2071-1050/9/6/904 |
| article html file updated | 25 September 2019 01:17 CEST | Update | - |
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| article html file updated | 28 June 2017 14:33 CEST | Update | - |
| article html file updated | 27 May 2017 11:51 CEST | Original file | - |
| article xml uploaded. | 27 May 2017 11:49 CEST | Original file | https://www.mdpi.com/2071-1050/9/6/904/xml |
| article pdf uploaded. | 27 May 2017 11:49 CEST | Version of Record | https://www.mdpi.com/2071-1050/9/6/904/pdf |
