Authors guarantee that they submit original works. They must give proper acknowledgment of the work of other authors and cite them. Plagiarism takes many forms, such as presenting another paper as the author(s) own paper,  copying or paraphrasing substantial parts of another author’s paper (without attribution), claiming pretension for results achieved by other researches. Plagiarism in all its forms constitutes unethical publishing behavior and is unacceptable. Publication of papers describing essentially the same research in more than one journal is unacceptable.