William Simons, George Trapp. Separating points by spheres. Discrete Mathematics, 10(1):163-166, 1974. [doi]
@article{SimonsT74,
title = {Separating points by spheres},
author = {William Simons and George Trapp},
year = {1974},
doi = {10.1016/0012-365X(74)90028-4},
url = {http://dx.doi.org/10.1016/0012-365X(74)90028-4},
researchr = {https://researchr.org/publication/SimonsT74},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {10},
number = {1},
pages = {163-166},
}