@article{oai:tsukuba.repo.nii.ac.jp:00015801,
 author = {Hanazawa, Masazumi},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {257--268},
 title = {On a classification of Aroszajn trees},
 volume = {4},
 year = {1980}
}