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Marcolungo, P. The ΔI = 1/2 rule of nonleptonic weak decays and diquark states in colour gauge theories of strong interactions. Lett. Nuovo Cimento 14, 135–138 (1975). https://doi.org/10.1007/BF02745702
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DOI: https://doi.org/10.1007/BF02745702