@article{oai:repository.dl.itc.u-tokyo.ac.jp:00041059,
 author = {Iwahori, Nobuko},
 journal = {Scientific papers of the College of General Education, University of Tokyo},
 month = {},
 note = {application/pdf},
 pages = {1--9},
 title = {On an Equivalence Relation Among (0, 1)-matrices},
 volume = {21},
 year = {1971}
}