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| article html file updated | 23 September 2019 23:30 CEST | Update | - |
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| article xml uploaded. | 24 March 2017 06:37 CET | Original file | https://www.mdpi.com/2304-6732/4/2/21/xml |
| article pdf uploaded. | 24 March 2017 06:37 CET | Updated version of record | https://www.mdpi.com/2304-6732/4/2/21/pdf |
| article pdf uploaded. | 23 March 2017 15:49 CET | Version of Record | https://www.mdpi.com/2304-6732/4/2/21/pdf-vor |