| article html file updated | 30 August 2025 02:54 CEST | Update | https://www.mdpi.com/2218-1997/4/3/50 |
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| article pdf uploaded. | 13 March 2018 10:59 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/3/50/pdf |
| article html file updated | 7 March 2018 11:14 CET | Original file | N/A |
| article xml uploaded. | 7 March 2018 11:13 CET | Original file | https://www.mdpi.com/2218-1997/4/3/50/xml |
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