Robinson, S P; Harris, P M; Ablitt, J; Hayman, G; Thompson, A; Isaev, A E*; Enyakov, A M*; Purcell, C*; Houqing, Z*; Yuebing, W*; Yue, Z*; Botha, P*; Krüger, D* (2006) An international key comparison of free-field hydrophone calibrations in the frequency range 1 to 500 kHz. J. Acoust. Soc. Am., 120 (3). pp. 1366-1373.