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| article xml uploaded. | 2 January 2018 12:56 CET | Original file | https://www.mdpi.com/1996-1073/11/1/88/xml |
| article pdf uploaded. | 2 January 2018 12:56 CET | Updated version of record | https://www.mdpi.com/1996-1073/11/1/88/pdf |
| article pdf uploaded. | 1 January 2018 12:23 CET | Version of Record | https://www.mdpi.com/1996-1073/11/1/88/pdf-vor |
