@article{oai:tsukuba.repo.nii.ac.jp:00015919,
 author = {Redmond, Don},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {99--105},
 title = {A generalization of a result of K.R. Johnson},
 volume = {13},
 year = {1989}
}