@article{oai:tsukuba.repo.nii.ac.jp:00033951, author = {平良, 和昭 and TAIRA, Kazuaki}, journal = {数理解析研究所講究録, RIMS Kokyuroku}, month = {Nov}, pages = {1--9}, title = {Hypo-Ellipticityの同値類について}, volume = {192}, year = {1973}, yomi = {タイラ, カズアキ} }