pH effects in the formation of interpolymer complexes between poly(N-vinylpyrrolidone) and poly(acrylic acid) in aqueous solutions Z.S. Nurkeeva, G.A. Mun, V.V. Khutoryanskiy, A.B. Bitekenova, A.V. Dubolazov and S.Zh. EsirkegenovaEur. Phys. J. E, 10 1 (2003) 65-68DOI: https://doi.org/10.1140/epje/e2003-00003-4