1. Nuclear data sheets for A=225;Akovali;Nucl. Data Sheets,1990
2. Levels in 221Fr fed by the α decay of 225Ac;Ardisson;Phys. Rev. C,2000
3. The AME2003 atomic mass evaluation (II). Tables, graphs, and references;Audi;Nucl. Phys. A,2003
4. Niveaux du francium 221 observes a partir de l’actinium 225;Bastin-Scoffier;C.R. Acad. Sci., Ser. B,1967
5. β-Decay of 221Fr and 217At nuclei;Chumin;Bull. Rus. Acad. Sci. Phys.,1995