@article{oai:tsukuba.repo.nii.ac.jp:00015744,
 author = {Guenther, Bernd},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {261--274},
 title = {Properties of normal embeddings concerning strong shape theory, I},
 volume = {15},
 year = {1991}
}