1. Nanofiltration – Principles and Applications;Kyburz,2005
2. Z. Twardowski, Nanofiltration of concentrated aqueous salt solutions, EP 0 821 615 B2
3. Nanofiltration – Principles and Applications;Schäfer,2005
4. G. Bargeman, R.L. Demmer, B. Kuzmanovic, C.E.J. van Lare, M.J.J Mayer, M.A.I. Schutyser and J.B. Westerink, Method for crystallizing solublesalts of divalent anions from brine, WO 2006/045718 A1