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“Amine additive reactions induced by the soft Lewis acidity of Pb2+ in halide perovskites. Part I: Evidence for Pb-alkylamide formation,” R.A. Kerner, T.H. Schloemer, P. Schulz, J.J. Berry, J. Schwartz, A. Sellinger, B.P. Rand, J. Mater. Chem. C, 7, 5251 (2019).