[1] L. CXII Rayleigh. The problem of the whispering gallery. Philos Mag, 20, 1001-1004(1910).
[18] TaV D Flexible whispering gallery mode optical microcavities for lasers and sensors (Nanyang Technological University, Singapore, 2014)Ta V D. Flexible whispering gallery mode optical microcavities for lasers and sensors (Nanyang Technological University, Singapore, 2014).