@article{oai:tsukuba.repo.nii.ac.jp:00016080,
 author = {Nunokawa, Mamoru and Kwon, Ohsang and Cho, Nak Eun},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {141--143},
 title = {On the multivalent functions},
 volume = {15},
 year = {1991}
}