What are you trying to do?
He is trying to pass control questions addressed to him from his professor to us. I doubt I want to answer.
promach, if you do not understand an article (that you should read carefully and completely), then you either did not think enough or just did not read some simpler articles before. Each academic article tries to maintain level of science culture giving reader references to all sources that was used and that are needed as background for understanding article's points. For example introducing first figure the author directly points you to  and  that are needed to understand that without redundant repetition of texts. If  or  is too complicated for you - go further by references in  and  or search for alternatives. One of them - thinking (starting from imbalanced mirror for example), worst of them - asking in forum to make your homework.