@article{oai:ynu.repo.nii.ac.jp:00006504,
 author = {Fukushima, Hiroshi},
 issue = {1},
 journal = {Yokohama Mathematical Journal = 横濱市立大學紀要. D部門, 数学},
 month = {},
 note = {application/pdf},
 pages = {49--54},
 title = {ON FIXED AND PERIODIC POINTS IN METRIC SPACES},
 volume = {18},
 year = {1970}
}