Medda, R., Jakobs, S., Hell, S. W., & Bewersdorf, J. (2006). 4Pi microscopy of quantum dot-labeled cellular structures. Journal of Structural Biology, 156(3), 517-523. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WM5-4KV3VYS-1-1&_cdi=6925&_user=38661&_orig=browse&_coverDate=12%2F31%2F2006&_sk=998439996&view=c&wchp=dGLbVtb-zSkzS&md5=368c2c9fc6d0cb8fa2fa7f0294f11090&ie=/sdarticle.pdf.