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Gleim, K.L.; Guo, B.C.; Keesee, R.G.; Castleman, A.W., Thermodynamics for the Clustering of Ammonia Onto Pb+ in the Gas Phase, J. Phys. Chem., 1989, 93, 18, 6805, https://doi.org/10.1021/j100355a044 . [all data]