@article{oai:tsukuba.repo.nii.ac.jp:00015803,
 author = {Nunokawa, Mamoru},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {453--455},
 title = {A note on multivalent functions},
 volume = {13},
 year = {1989}
}