| article html file updated | 30 August 2025 02:39 CEST | Update | https://www.mdpi.com/2218-1997/4/2/40 |
| article html file updated | 16 July 2022 09:19 CEST | Update | N/A |
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| article html file updated | 14 March 2018 09:43 CET | Update | N/A |
| article html file updated | 26 February 2018 06:36 CET | Update | N/A |
| article xml uploaded. | 26 February 2018 06:35 CET | Update | https://www.mdpi.com/2218-1997/4/2/40/xml |
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| article pdf uploaded. | 26 February 2018 06:35 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/2/40/pdf |
| article html file updated | 16 February 2018 15:05 CET | Original file | N/A |
| article xml uploaded. | 16 February 2018 15:03 CET | Update | N/A |
| article xml uploaded. | 16 February 2018 15:03 CET | Original file | N/A |
| article pdf uploaded. | 16 February 2018 15:03 CET | Version of Record | https://www.mdpi.com/2218-1997/4/2/40/pdf-vor |
