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| article xml uploaded. | 12 April 2018 03:01 CEST | Original file | https://www.mdpi.com/2220-9964/7/4/146/xml |
| article pdf uploaded. | 12 April 2018 03:01 CEST | Updated version of record | https://www.mdpi.com/2220-9964/7/4/146/pdf |
| article pdf uploaded. | 10 April 2018 18:06 CEST | Version of Record | https://www.mdpi.com/2220-9964/7/4/146/pdf-vor |
