Determination of degree of ionization of poly(allylamine hydrochloride) (PAH) and poly[1-[4-(3-carboxy‑4 hydroxyphenylazo)benzene sulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) in layer-by-layer films using vacuum photoabsorption spectroscopy - Ferreira, Quirina; Gomes, P. J.; Ribeiro, P. A.; Jones, N. C.; Hoffmann, S. V.; Mason, N. J.; Oliveira Junior, Osvaldo Novais de; Raposo, M. (Langmuir, 2013)