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DPEs with homogeneous catalysts in the presence of PTC (where 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19 represent the references [241], [248], [230], [238], [236], [240], [231], [228], [206], [208], [226], [225], [235], [227], [233], [229], [237], [232], [234], respectively).
