@article{10_4153_CJM_1967_100_x,
     author = {T\'oth, L. Fejes and Heppes, A.},
     title = {A {Variant} of the {Problem} of the {Thirteen} {Spheres}},
     journal = {Canadian journal of mathematics},
     pages = {1092--1100},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-100-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-100-x/}
}