https://opg.optica.org/ol/fulltext.cfm?uri=ol-30-18-2469 (Publisher version)
Joly, N. Y., Birks, T. A., Yulin, A., Knight, J. C., & Russell, P. S. (2005). Linear and nonlinear guidance in an ultralow loss planar glass membrane. Optics Letters, 30, 2469-2471. doi:10.1364/OL.30.002469.