1. Abraham F, Kidd J, Koshiba M, Levi Setti R, Tsao C H and Wolter W 1963a,Nuovo Cimento 28 221; 1963bNuovo Cimento 29 315
2. Anand K C, Daniel R R and Stephens S A 1968Phys. Rev. Lett. 20 764
3. Anand K C, Daniel R R and Stephens S A 1970Acta Phys. Acad. Sci. Hung. 29, Suppl. 1, 229
4. Anand K C, Daniel R R and Stephens S A 1971Proc. Twelfth Int. Conf. Cosmic Rays, Hobart HE-55.
5. Anand K C, Daniel R R and Stephens S A 1971Proc. Twelfth Int. Conf. Cosmic Rays, Hobart OG-39