This journal is an open access journal and comply with I4OC standards for open citations. Open access to content is provided on the basis of the following principle: free open access to research results contributes to an increase in the global exchange of knowledge. All articles are made freely available to readers immediately upon publication. Our open access policy is in accordance with the Budapest Open Access Initiative (BOAI) definition — it means that articles have free availability on the public internet, permitting any users to read, download, copy, distribute, print, search, or link to the full texts of these articles, crawl them for indexing, pass them as data to software, or use them for any other lawful purpose, without financial, legal, or technical barriers other than those inseparable from gaining access to the internet itself. For more information please read BOAI statement.    
This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge (open license Creative Commons ).
Publications are licensed by Creative Commons International Public License: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)  , which allows unrestricted use of works for non-commercial purposes, subject to attribution.
You are free to:

• Share— copy and redistribute the material in any medium or format
• Adapt— remix, transform, and build upon the material

The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:

• Attribution— You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
• NonCommercial— You may not use the material for commercial purposes.
• No additional restrictions— You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

Notices:

• You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.
• No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.

Notices:
You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.
No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.
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The page is based on original materials from the Creative Commons: 
https://creativecommons.org/licenses/by-nc/4.0/ 
https://creativecommons.org/licenses/by/4.0/legalcode 
https://creativecommons.org/licenses/by/4.0/deed.en
Self-archiving policy

• Authors are permitted to deposit all versions of their paper in an institutional or subject repository.
  • Preprint
  • Author’s Accepted Manuscript
  • Published article (Version of Record)

Subscription
The electronic version of the journal is distributed on the Internet on an open access basis. A subscription to the journal is not required to access published articles in electronic form on the journal’s website.