Higa, O, K Higa, H Maehara, S Tanaka, K Shimojima, A Takemoto, K Hokamoto, and S Itoh. 2014. “Effects of Improving Current Characteristics of Spark Discharge on Underwater Shock Waves”. The International Journal of Multiphysics 8 (2):245-52. https://doi.org/10.1260/1750-9548.8.2.245.