ime/magazine/article/0, 9171,743159,00. html. Retrieved 2007-04-01. p> 25. MacPherson, H. G. (1934). "An Investigation of the Magneto-Optic Method of Chemical Analysis ". Physical Review (American Physical Society) 47 (4): 310-315. doi: 10.1103/PhysRev.47.310.
26. a b c "Francium", McGraw-Hill Encyclopedia of Science & Technology, 7, McGraw-Hill Professional, 2002, pp. 493-494, ISBN 0-07-913665-6
27. Grant, Julius (1969), "Francium", Hackh's Chemical Dictionary, McGraw-Hill, pp. 279-280
28. "History". Francium. State University of New York at Stony Brook. 2007-02-20. 29. Winter, Mark. "Geological information". Francium. The University of Sheffield. 30. a b "Cooling and Trapping". Francium. State University of New York at Stony Brook. 2007-02-20. 31. "Production of Francium ". Francium. State University of New York at Stony Brook. 2007-02-20. 32. "Francium". Los Alamos National Laboratory Chemistry Division. 2003-12-15. 33. Considine, Glenn D., ed (2005). Francium, in Van Nostrand's Encyclopedia of Chemistry. New York: Wiley-Interscience. p. 679. ISBN 0-471-61525-0. p> 34. National Nuclear Data Center (1990). "Table of Isotopes decay data". Brookhaven National Laboratory. 35. National Nuclear Data Center (2003). "Fr Isotopes". Brookhaven National Laboratory.
