van den Vlekkert, H. H.de Rooij, N. F.van den Berg, A.Grisel, A.2009-05-122009-05-122009-05-12199010.1016/0925-4005(90)80237-Thttps://infoscience.epfl.ch/handle/20.500.14299/39990Multi-ion Sensing System Based on Glass-encapsulated pH-ISFETs and a Pseudo-REFETtext::journal::journal article::research article