Ocus groups used in investigating students perspectives (in higher education)

I am looking for a litereature review on focus groups, presenting the strenghts and weaknesses of this research method. In the essay I would like to be explained why this method was chosen, what was expected to be found as well as strengths and weaknesses of the method.
I would like mainly research articles to be used mainly by the following Journals: Higher Education, Studies in Higher Education, Research in Higher Education, Educational Research.
I will upload a few research articles that I would like you to read as well.
Thank you very much!