Possible Duplicate:
Is it normal for BibTeX to replace similar author names with “------”?
I am compiling a latex file and the some papers in the references section do not have the authors' name after compilation. Please see reference [7] in the image below. Its bibtex entry is as below
@book{Welford1968_Book,
Address = {London},
Author = {Alan Traviss Welford},
Publisher = {Methuen},
Title = {Fundamentals of Skill},
Year = {1968}}

does any body know why this happens?
natbibor other relevant package? Some styles replace repeated name authors with dashes. – Gonzalo Medina Sep 27 '12 at 05:18\bibliographystyle{alpha}, that is. – Werner Sep 27 '12 at 05:21natbiband I am using\bibliographystyle{IEEEtran}– Mark Sep 27 '12 at 05:22\bibliographystyle{IEEEtran}thanks – Mark Sep 27 '12 at 05:25IEEEtran. – Gonzalo Medina Sep 27 '12 at 05:35