| article html file updated | 8 February 2020 23:17 CET | Update | https://www.mdpi.com/2076-3921/6/4/101 |
| article html file updated | 29 September 2019 00:37 CEST | Update | N/A |
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| article html file updated | 18 April 2019 07:58 CEST | Update | N/A |
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| article html file updated | 6 December 2017 10:05 CET | Original file | N/A |
| article xml uploaded. | 6 December 2017 10:04 CET | Original file | https://www.mdpi.com/2076-3921/6/4/101/xml |
| article pdf uploaded. | 6 December 2017 10:04 CET | Version of Record | https://www.mdpi.com/2076-3921/6/4/101/pdf |
