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| article pdf uploaded. | 7 December 2018 09:09 CET | Updated version of record | https://www.mdpi.com/2227-7390/6/12/302/pdf |
| article xml uploaded. | 7 December 2018 09:09 CET | Update | https://www.mdpi.com/2227-7390/6/12/302/xml |
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| article pdf uploaded. | 4 December 2018 17:07 CET | Updated version of record | https://www.mdpi.com/2227-7390/6/12/302/pdf-vor |
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