| article html file updated | 31 August 2025 06:01 CEST | Update | https://www.mdpi.com/2227-9709/6/4/52 |
| article html file updated | 19 July 2022 22:13 CEST | Update | N/A |
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| article html file updated | 31 December 2019 08:54 CET | Update | N/A |
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| article pdf uploaded. | 19 December 2019 08:51 CET | Updated version of record | https://www.mdpi.com/2227-9709/6/4/52/pdf |
| article xml uploaded. | 19 December 2019 08:51 CET | Update | https://www.mdpi.com/2227-9709/6/4/52/xml |
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| article pdf uploaded. | 7 December 2019 11:10 CET | Version of Record | https://www.mdpi.com/2227-9709/6/4/52/pdf-vor |
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