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2- https://scholar.google.com/citations?view_op=view_citation&hl=en&user=LoKddH8AAAAJ&citation_for_view=LoKddH8AAAAJ:u-x6o8ySG0sC
3- https://scholar.google.com/citations?view_op=view_citation&hl=en&user=LoKddH8AAAAJ&citation_for_view=LoKddH8AAAAJ:d1gkVwhDpl0C
4- https://scholar.google.com/citations?view_op=view_citation&hl=en&user=LoKddH8AAAAJ&citation_for_view=LoKddH8AAAAJ:9yKSN-GCB0IC
5- https://scholar.google.com/citations?view_op=view_citation&hl=en&user=LoKddH8AAAAJ&citation_for_view=LoKddH8AAAAJ:qjMakFHDy7sC
