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This journal provides open access to its content in accordance with the basic premise that the free public availability of research benefits the exchange of knowledge throughout the world.

Authors wishing to publish in this journal agree to the following:

1. The author/s retain/s the copyrights and consent/s to initial publication of the work in the journal under a Creative Commons Attribution licence, which allows third parties to use the work by citing the name/s of the author/s and this journal as initial publisher (in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 DE-Licence).

2. The author/s can enter into additional contracts for the non-exclusive distribution (e.g. publish in a collection or book) of the version published in the journal, if the journal is cited as initial publisher.