Belov, V., Bossi, M., Foelling, J., Boyarskiy, P., & Hell, S. W. (2009). Rhodamine spiroamides for multicolor single-molecule switching fluorescent nanoscopy. Chemistry, 15(41), 10762-10776. Retrieved from http://www3.interscience.wiley.com/cgi-bin/fulltext/122599437/PDFSTART.