Positron annihilation as a probe of electronic density in the two-dimensional conductor 1T-TAS2 F. Boileau, B. Geffroy, R. Paulin, P. Molinie and L. Zuppiroli J. Phys. France, 44 10 (1983) 1157-1166 DOI: 10.1051/jphys:0198300440100115700