@article{oai:tsukuba.repo.nii.ac.jp:00015709, author = {Kang, Joo Ho and Baik, Hyoung Gu}, issue = {1}, journal = {Tsukuba Journal of Mathematics}, month = {Jun}, pages = {69--78}, title = {A study on the unicellularity of some lower triangular operators}, volume = {18}, year = {1994} }