@article{oai:tsukuba.repo.nii.ac.jp:00017185, author = {Doumeki, Atsushi}, issue = {2}, journal = {Tsukuba Journal of Mathematics}, month = {Oct}, pages = {483--508}, title = {The Semiclassical Estimate of the Eigenvalue Splitting for the Kac Operator}, volume = {22}, year = {1998} }