| article html file updated | 9 February 2020 12:05 CET | Update | https://www.mdpi.com/2075-4701/8/4/227 | 
| article html file updated | 2 October 2019 04:20 CEST | Update | - | 
| article html file updated | 1 May 2019 06:59 CEST | Update | - | 
| article html file updated | 17 April 2019 07:00 CEST | Update | - | 
| article html file updated | 29 March 2019 11:42 CET | Update | - | 
| article html file updated | 1 May 2018 07:29 CEST | Update | - | 
| article html file updated | 1 May 2018 07:29 CEST | Update | - | 
| article html file updated | 1 April 2018 04:26 CEST | Original file | - | 
| article xml uploaded. | 1 April 2018 04:24 CEST | Update | https://www.mdpi.com/2075-4701/8/4/227/xml | 
| article pdf uploaded. | 1 April 2018 04:24 CEST | Version of Record | https://www.mdpi.com/2075-4701/8/4/227/pdf |