['Recently', ',', 'several', 'IEDP', 'measurements', 'of', 'mixed', 'conducting', 'cathode', 'materials', 'were', 'published', 'with', 'the', 'oxide', 'films', 'being', 'deposited', 'on', 'insulating', 'substrates', '[', '17–19', ']', '.']