1@Article{murrell:1999,
2  author = 	 {Paul R. Murrell},
3  title = 	 {Layouts:  A mechanism for arranging plots on a page},
4  journal = 	 {Journal of Computational and Graphical Statistics},
5  year = 	 1999,
6  volume =       8,
7  pages =        {121--134}
8}
9