  Many other factors affecting citation of publications, except for research
area coverage, have been studied. This study aims to investigate impact of
research area coverage. Bibliometric papers and their related papers (referred
papers, citing papers and first author's papers) were screened and matched by
Python program. Papers' research areas were classified according to Web of
Science. Bibliometric parameters of the most cited 5% and the least cited 5%
papers were compared. Firstly, coverage of related papers' research areas
impacts the citation of their original papers. The impact of references and
citing papers are positive and negative, separately, while the first author's
papers have no influence. Secondly, high-influence papers tend to cite
references from a wider area and are cited by followers from a wider area.
Additionally, the pattern of knowledge flow differs significantly between high-
and low-influence papers. Low-influence papers narrow knowledge flow, whereas
high-influence papers broaden it. This study has shown that both depth and
breadth of research area coverage can influence citations. It is recommended
that authors should extensively cite high-influence publications, both within
and beyond their own area.
