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@article{10_4064_aa136_2_5, author = {Alan Filipin}, title = {An irregular $D(4)$-quadruple cannot be extended to a quintuple}, journal = {Acta Arithmetica}, pages = {167--176}, publisher = {mathdoc}, volume = {136}, number = {2}, year = {2009}, doi = {10.4064/aa136-2-5}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/aa136-2-5/} }
Alan Filipin. An irregular $D(4)$-quadruple cannot be extended to a quintuple. Acta Arithmetica, Tome 136 (2009) no. 2, pp. 167-176. doi : 10.4064/aa136-2-5. http://geodesic.mathdoc.fr/articles/10.4064/aa136-2-5/
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