| article html file updated | 12 August 2026 19:31 CEST | Update | https://www.mdpi.com/2221-3759/1/2/64 |
| article html file updated | 6 February 2020 02:50 CET | Update | N/A |
| article html file updated | 8 May 2019 03:37 CEST | Update | N/A |
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| article html file updated | 17 June 2015 10:34 CEST | Original file | N/A |
| article pdf uploaded. | 26 June 2013 09:46 CEST | Version of Record | https://www.mdpi.com/2221-3759/1/2/64/pdf |
