Abstract
In this note, we completely settle the existence of 2-chromatic (v, 5, 1)-designs. This settles a problem posed by Rosa and Colbourn.
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Ling, A.C.H. On 2-chromatic (v, 5, 1)-designs. J Geom 66, 144–148 (1999). https://doi.org/10.1007/BF01225678
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DOI: https://doi.org/10.1007/BF01225678