@article{oai:ir.kagoshima-u.ac.jp:00003955,
 author = {SAKAI, Koukichi},
 journal = {鹿児島大学理学部紀要, Reports of the Faculty of Science, Kagoshima University},
 month = {Dec},
 pages = {1--5},
 title = {On Graphs Having Exact Two Vertices with the Same Degree},
 volume = {30},
 year = {1997}
}