1. Malik, F. and Khan, E. and Qureshi, I. and (2002) Radiat. Meas., 35, pp. 301.
2. Puglisi, R. and Pereira, M. and Moraes, M. and (1999) Appl. Radiat. Isot., 50, pp. 375.
3. Sinha, D. and Dwivedi, K. (2003) Radiat. Meas., 36, pp. 713.
4. Stejny, J. and Portwood, T. (1986) Nucl. Tracks Radiat. Meas., 12(1–6), pp. 59 - 62.
5. Price, P. and Shirk, E. and Kinoshita, K. and (1979). . 16th International Cosmic Ray Conferenc . In [ pp. 80 - 85] . .