@article{10_4153_CJM_1981_014_5,
     author = {Daverman, R. J. and Loveland, L. D.},
     title = {Any {2-Sphere} in {E} 3 with {Uniform} {Interior} {Tangent} {Balls} is {Flat}},
     journal = {Canadian journal of mathematics},
     pages = {150--167},
     year = {1981},
     volume = {33},
     number = {1},
     doi = {10.4153/CJM-1981-014-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-014-5/}
}