1. Further experiments with liquid helium. c. on the change of electric resistance of pure metals at very low temperatures, etc. iv. the resistance of pure mercury at helium temperatures;Onnes,1911
2. Further experiments with liquid helium. d. on the change of electric resistance of pure metals at very low temperatures, etc. v. the disappearance of the resistance of mercury;Onnes,1911
3. Further experiments with liquid helium. g. on the electrical resistance of pure metals, etc. vi. on the sudden change in the rate at which the resistance of mercury disappears;Onnes,1911
4. Possible high Tc superconductivity in the Ba-La-Cu-O system;Bednorz;Z. Phys. B,1986
5. Superconductivity above 130 K in the Hg-Ba-Ca-Cu-O system;Schilling;Nature,1993