Robinson, S P; Green, G J; Preston, R C; Peirlinckx, L*; Kofoed, L*; Skodborg, C*; Roy, A*; Mori, Y*; Brenner, A*; Kruger, D*; Buogo, S*; Cannelli, G*; Troiano, L*; Runborg, C*; Gooch, G* (1999) International comparison of free-field hydrophone calibrations in the frequency range 10 kHz to 315kHz. Metrologia, 36 (4). pp. 287-96.