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@article{JRAM_1970__245_151053, author = {Hans J. Sperling}, title = {On the real singularities of the {N-body} problem.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {15--40}, publisher = {mathdoc}, volume = {245}, year = {1970}, zbl = {0207.23301}, url = {http://geodesic.mathdoc.fr/item/JRAM_1970__245_151053/} }
Hans J. Sperling. On the real singularities of the N-body problem.. Journal für die reine und angewandte Mathematik, Tome 245 (1970), pp. 15-40. http://geodesic.mathdoc.fr/item/JRAM_1970__245_151053/