1. Possible high Tc superconductivity in the Ba-La-Cu-O system;J G Bednorz;Z. Phys. B,1986
2. Universal Correlations between T c and n s /m * (Carrier Density over Effective Mass) in High-T c Cuprate Superconductors;B X Williams;Phys. Rev. Lett,1989
3. Basic Similarities among Cuprate, Bismuthate,Organic, Chevrel Phase, and Heavy-Fermion Superconductors Shown by Penetration Depth Measurements;Y J Uemura;Phys. Rev. Lett,1991
4. Interacting Rotons and Superfluidity in Liquid Helium;J Ruvalds;Phys. Rev. Lett,1971