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- [14] PYRYLIUM SALTS .V. FORMATION OF A TRIPLE PYRYLIUM CATION BY DOUBLE PROTONATION OF A DELTA-DIKETONE ENCLOSED IN PYRYLOCYANINE MESOMERIC SYSTEM . A NEW INDICATOR FOR ACIDIMETRY IN NON-AQUEOUS MEDIUM BULLETIN DE LA SOCIETE CHIMIQUE DE FRANCE, 1968, (02): : 832 - &