| article html file updated | 9 February 2020 03:06 CET | Update | https://www.mdpi.com/2227-9091/6/1/4 |
| article html file updated | 2 May 2019 02:10 CEST | Update | - |
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| article html file updated | 27 March 2018 15:04 CEST | Update | - |
| article html file updated | 15 January 2018 17:46 CET | Original file | - |
| article xml uploaded. | 15 January 2018 17:45 CET | Original file | https://www.mdpi.com/2227-9091/6/1/4/xml |
| article pdf uploaded. | 15 January 2018 17:45 CET | Version of Record | https://www.mdpi.com/2227-9091/6/1/4/pdf |
