@article{oai:u-ryukyu.repo.nii.ac.jp:02004491,
 author = {Maehara, Hiroshi and 前原, 濶},
 issue = {28},
 journal = {琉球大学教育学部紀要 第二部},
 month = {Feb},
 note = {Two kinds of quotient graphs: reduced graphs and modified graphs, are considered and enumerated., 紀要論文},
 pages = {1--6},
 title = {A Note on Quotient Graphs},
 year = {1985}
}