| article html file updated | 9 February 2020 00:55 CET | Update | https://www.mdpi.com/2076-3271/6/1/2 |
| article html file updated | 29 September 2019 10:07 CEST | Update | N/A |
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| article html file updated | 22 December 2017 12:50 CET | Original file | N/A |
| article xml uploaded. | 22 December 2017 12:49 CET | Update | https://www.mdpi.com/2076-3271/6/1/2/xml |
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| article pdf uploaded. | 22 December 2017 12:49 CET | Version of Record | https://www.mdpi.com/2076-3271/6/1/2/pdf |