1. G. M. de’ Munari andG. Mambriani:Suppl. Nuovo Cimento,19, 314 (1961);Proposal for an experiment on double beta-decay of xenon 136, INFN-Milano, internal report (1961).
2. J. B. Birks:The Theory and Practice of Scintillation Counting (Oxford, 1964)
3. P. E. Argan, N. D’Angelo andA. Gigli:Nuovo Cimento,1, 761 (1955);P. E. Argan andA. Gigli:Nuovo Cimento,3, 1337 (1956).
4. See, for instance,J. G. Wilson:The Principles of Cloud Chamber Technique (Cambridge, 1951);N. N. Das Gupta andS. K. Gosh:Rev. Mod. Phys.,18, 225 (1946).
5. M. Volmer andH. Flood:Zeits. Phys. Chem.,170, 273 (1934).