(1) The paper prior to submission should be checked for plagiarism from licensed plagiarism softwares like iThenticate. The similarity content should not exceed 20% (in any case either self contents or others). Further, you have to strictly implement the following ethical guidelines for publication:
(2) Any form of self-plagiarism or plagiarism from others' work(s) should not be there in an article. 
If any model / concept / figure / table / data / conclusive comment by any previously published work is used in your article, you should properly cite a reference to the original work. 
(3) Also language of explaining it should not be same as language of the work from which you have adopted it.