| article html file updated | 9 February 2020 02:31 CET | Update | https://www.mdpi.com/2227-9717/6/1/4 |
| article html file updated | 2 May 2019 03:21 CEST | Update | - |
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| article html file updated | 1 February 2018 12:49 CET | Update | - |
| article pdf uploaded. | 10 January 2018 11:21 CET | Updated version of record | https://www.mdpi.com/2227-9717/6/1/4/pdf |
| article html file updated | 10 January 2018 07:21 CET | Original file | - |
| article xml uploaded. | 10 January 2018 07:20 CET | Original file | https://www.mdpi.com/2227-9717/6/1/4/xml |
| article pdf uploaded. | 10 January 2018 07:20 CET | Version of Record | - |
