| article html file updated | 7 February 2020 06:31 CET | Update | https://www.mdpi.com/2225-1146/4/2/20 |
| article html file updated | 21 September 2019 14:08 CEST | Update | - |
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| article html file updated | 29 March 2016 13:24 CEST | Original file | - |
| article xml uploaded. | 29 March 2016 13:22 CEST | Original file | https://www.mdpi.com/2225-1146/4/2/20/xml |
| article pdf uploaded. | 29 March 2016 13:22 CEST | Version of Record | https://www.mdpi.com/2225-1146/4/2/20/pdf |
