Two-dimensional electronic properties of the purple potassium molybdenum bronze K0.9Mo6O17 R. Buder, J. Devenyi, J. Dumas, J. Marcus, J. Mercier, C. Schlenker et H. Vincent J. Physique Lett., 43 2 (1982) 59-65 DOI: 10.1051/jphyslet:0198200430205900