| article html file updated | 7 February 2020 23:58 CET | Update | https://www.mdpi.com/2309-608X/3/1/9 |
| article html file updated | 23 September 2019 11:08 CEST | Update | - |
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| article html file updated | 11 December 2018 09:16 CET | Update | - |
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| article html file updated | 22 February 2017 09:55 CET | Original file | - |
| article xml uploaded. | 22 February 2017 09:53 CET | Original file | https://www.mdpi.com/2309-608X/3/1/9/xml |
| article pdf uploaded. | 22 February 2017 09:53 CET | Version of Record | https://www.mdpi.com/2309-608X/3/1/9/pdf |
