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| article pdf uploaded. | 11 December 2018 08:54 CET | Updated version of record | https://www.mdpi.com/2226-4787/6/4/131/pdf |
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| article html file updated | 10 December 2018 08:36 CET | Update | - |
| article pdf uploaded. | 10 December 2018 08:35 CET | Updated version of record | https://www.mdpi.com/2226-4787/6/4/131/pdf-vor |
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| article xml uploaded. | 9 December 2018 09:05 CET | Update | - |
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