@article{oai:kitami-it.repo.nii.ac.jp:00006241,
 author = {Shigeo, KATO},
 issue = {4},
 journal = {北見工業大学研究報告},
 month = {Dec},
 note = {application/pdf},
 pages = {589--596},
 title = {Note on the Approximation of Nonlinear Semi-Groups in Hilbert Space},
 volume = {2},
 year = {1969}
}