| article html file updated | 8 February 2020 02:36 CET | Update | https://www.mdpi.com/2076-0787/6/2/12 |
| article html file updated | 4 May 2019 04:15 CEST | Update | - |
| article html file updated | 13 April 2017 05:07 CEST | Update | - |
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| article html file updated | 30 March 2017 14:17 CEST | Original file | - |
| article xml uploaded. | 30 March 2017 14:16 CEST | Original file | https://www.mdpi.com/2076-0787/6/2/12/xml |
| article pdf uploaded. | 30 March 2017 14:16 CEST | Version of Record | https://www.mdpi.com/2076-0787/6/2/12/pdf |
