| article html file updated | 7 February 2020 19:43 CET | Update | https://www.mdpi.com/2076-0817/5/4/68 |
| article html file updated | 22 September 2019 12:05 CEST | Update | - |
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| article html file updated | 29 December 2016 11:53 CET | Update | - |
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| article xml uploaded. | 15 December 2016 15:52 CET | Original file | https://www.mdpi.com/2076-0817/5/4/68/xml |
| article pdf uploaded. | 15 December 2016 15:52 CET | Version of Record | https://www.mdpi.com/2076-0817/5/4/68/pdf |
