| article html file updated | 7 February 2020 02:50 CET | Update | https://www.mdpi.com/1420-3049/21/1/2 |
| article html file updated | 21 September 2019 08:53 CEST | Update | - |
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| article html file updated | 12 November 2018 03:55 CET | Original file | - |
| article pdf uploaded. | 29 December 2015 11:44 CET | Version of Record | https://www.mdpi.com/1420-3049/21/1/2/pdf |
| article xml uploaded. | 29 December 2015 11:44 CET | Original file | https://www.mdpi.com/1420-3049/21/1/2/xml |
