V. L. Lokre, B. J. Abhyankar, S. L. Mankikar, S. S. Gopalani, M. T. Karmarkar, and M. V. Vaidya, “Comparison of Piezo and Ball Copper Pressure Measurements in Closed Vessel System”, Def. Sc. J., vol. 27, no. 3, pp. 105–108, Jul. 2014.