Polymeric organic-inorganic proton conducting membranes based on sulfonated derivatives of hyperbranched polyesterpolyols - V. V. Shevchenko; N. S. Klimenko; A. V. Strjutskij; A. V. Shevchuk; E. A. Lysenkov; Ja. Vortman; V. V. Davidenko (Polymer journal, 2013)