| article html file updated | 9 February 2020 01:53 CET | Update | https://www.mdpi.com/2220-9964/7/1/12 |
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| article xml uploaded. | 3 January 2018 12:54 CET | Update | https://www.mdpi.com/2220-9964/7/1/12/xml |
| article pdf uploaded. | 3 January 2018 12:54 CET | Version of Record | https://www.mdpi.com/2220-9964/7/1/12/pdf |