Citation: K. Sieburg et W. Preetz, Synthesis, B-11 NMR and vibrational spectra of mononitrooctahydro-closo-nonaborate (2-) and monoaminooctahydro-closo-nonaborate(2-) and crystal structure of (Ph4P)(2)[1-(NO2)B9H8]center dot CH3CN, Z NATURFO B, 55(6), 2000, pp. 479-483