| article html file updated | 31 August 2025 15:27 CEST | Update | https://www.mdpi.com/2227-9059/8/4/68 |
| article html file updated | 20 July 2022 23:57 CEST | Update | - |
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| article pdf uploaded. | 2 April 2020 03:12 CEST | Updated version of record | https://www.mdpi.com/2227-9059/8/4/68/pdf |
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| article pdf uploaded. | 25 March 2020 14:13 CET | Version of Record | https://www.mdpi.com/2227-9059/8/4/68/pdf-vor |
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