@article{2011, title={Asymptotic solution with higher-order approximation for transient whispering gallery mode radiation field excited by a UWB pulse source}, author={Keiji Goto and Toru Kawano and Toyohiko Ishihara}, journal={IEICE Electronics Express}, volume={8}, number={8}, pages={561-567}, year={2011}, doi={10.1587/elex.8.561} }