You can search for any reference by title, author, date, editor, journal and publisher. Searching is case insensitive, and allows for only partial terms (e.g. seq with pickup both RNA-Seq and sequencing) matching. You can also use advanced queries that are detailed here.
Schmucker et al. (2001) "Aging impairs intestinal immunity." Mech. Ageing Dev. 122(13):1397-1411 (PubMed)