Ion transport investigations of polypyrroles doped with different anions by EQCM and CER techniquesSõritski, Vitali; Öpik, Andres; Forsen, OlofElectrochimica acta2003 / 10, p. 1409-1417 : ill https://www.sciencedirect.com/science/article/pii/S0013468603000185