@article{oai:ynu.repo.nii.ac.jp:00006969,
 author = {Masuda, Keiichi and Nagase, Teruo},
 issue = {1},
 journal = {Yokohama Mathematical Journal = 横濱市立大學紀要. D部門, 数学},
 month = {},
 note = {application/pdf, We give a method to construct all of the extensions of a nice immersion of the 2-sphere into the Euclidean 3-space by using a sphere.},
 pages = {17--35},
 title = {A CRITERION SPHERE FOR EXTENSIONS OF A NICE IMMERSION OF THE 2-SPHERE INTO THE EUCLIDEAN 3-SPACE},
 volume = {49},
 year = {2001}
}