@article{10_4153_CMB_1975_093_8,
     author = {Haruki, Hiroshi},
     title = {A {Functional} {Equation} {Arising} from {Ivory's} {Theorem} in {Geometry}},
     journal = {Canadian mathematical bulletin},
     pages = {507--516},
     year = {1975},
     volume = {18},
     number = {4},
     doi = {10.4153/CMB-1975-093-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-093-8/}
}