眼睛贼亮啊，不过有个逗号不影响编译。我不知道我是从哪里学来这个“坏习惯”，也许是R：
> citation('MASS')</p>
<p>To cite the MASS package in publications use:</p>
<p> Venables, W. N. & Ripley, B. D. (2002) Modern Applied Statistics<br />
with S. Fourth Edition. Springer, New York. ISBN 0-387-95457-0</p>
<p>A BibTeX entry for LaTeX users is</p>
<p> @Book{,<br />
title = {Modern Applied Statistics with S},<br />
author = {W. N. Venables and B. D. Ripley},<br />
publisher = {Springer},<br />
edition = {Fourth},<br />
address = {New York},<br />
year = {2002},<br />
note = {ISBN 0-387-95457-0},<br />
url = {http://www.stats.ox.ac.uk/pub/MASS4},<br />
}<br />
</p>
