Rankin, B., Kellner, R., & Hell, S. W. (2008). Stimulated-emission-depletion microscopy with a multicolor stimulated-Raman-scattering light source. Optics Letters, 33(21), 2491-2493. Retrieved from http://www.opticsinfobase.org/ol/viewmedia.cfm?uri=ol-33-21-2491&seq=0.