| Element | license |
<xsd:attribute name="license-type" use="optional" type="xsd:string"/> |
|
© 2018 by the authors. |
|
2018 |
|
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( |
|
http://creativecommons.org/licenses/by/4.0/ |
|
). |