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.
Ponnappan et al. (1999) "Decreased proteasome-mediated degradation in T cells from the elderly: A role in immune senescence." Cell. Immunol. 192(2):167-174 (PubMed)