By default, LaTeX makes entries in the bibliography look like:
 Doe, Joe et al. Some journal. 2004.<br/>  Doe, Jane et al. Some journal. 2003.
while many documents need something like:
This sort of change may be achieved by many of the “general” citation packages; for example, in natbib, it's as simple as:
but if you're not using such a package, the following internal LaTeX commands, in the preamble of your document, will do the job: