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1. Christopher Kelk Ingold and Henry Alfred Piggott, "CLXX.—The mobility of symmetrical triad systems. Part II. The conditions relating to systems terminated by the o-phenylene group. Derivatives of indene", J. Chem. Soc., Trans., 1923, 123, 1469 - 1509.
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dx.doi.org/10.1039/CT9232301469
