# How do I include math mode in a bibliography entry with ieee style?

I just spent a while identifying that this one reference in my bib file was preventing compilation after running bib mwe. I get the error: ! Extra }, or forgotten $.. I found that it would compile when I changed the style to certain ones but not ieee nor phys. The problem is the greek character \lambda in the title. How can I get this citation to work with these biblatex styles? \begin{filecontents}{\jobname.bib} @article{qiu_saltdependent_2011, title = {Salt-Dependent DNA-DNA Spacings in Intact Bacteriophage$\ensuremath{\lambda}$Reflect Relative Importance of DNA Self-Repulsion and Bending Energies}, % ieee does not like math mode commands % title = {Salt-Dependent DNA DNA Spacings in Intact Bacteriophage lambda Reflect Relative Importance of DNA Self Repulsion and Bending Energies}, % runs fine author = {Qiu, Xiangyun and Rau, Donald C. and Parsegian, V. Adrian and Fang, Li Tai and Knobler, Charles M. and Gelbart, William M.}, journal = {Phys. Rev. Lett.}, volume = {106}, issue = {2}, pages = {028102}, numpages = {4}, year = {2011}, month = {Jan}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.106.028102}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.106.028102} } \end{filecontents} \documentclass{article} \usepackage[ % style=phys, % ! Extra }, or forgotten$.