An irregular $D(4)$-quadruple cannot be
 extended to a quintuple

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Alan Filipin Acta Arithmetica 136 (2009), 167-176 MSC: 11D09, 11D45. DOI: 10.4064/aa136-2-5

Alan FilipinFaculty of Civil Engineering
University of Zagreb
Fra Andrije Kačića-Miošića 26
10000 Zagreb, Croatia
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