1. The study of elementary particles by the photographic method;Powell,1959
2. Mass Analysis of the Secondary Particles Produced by the 25-Gev Proton Beam of the Cern Proton Synchrotron
3. G. von Dardel, R.M. Mermod, G. Weber and K. Winter, Proc. 1960 Int. Conf. on High-Energy Physics, p. 837
4. L. Gilly et al., Proc. 1960 Int. Conf. on High-Energy Physics, p. 808