Mullen, T. J., R. D. Berger, C. M. Oman, and R. J. Cohen, "Human heart rate variability relation is unchanged during motion sickness", J Vestib Res, vol. 8, no. 1, pp. 95-105, Jan-Feb, 1998.

Mullen, T. J., R. D. Berger, R. J. Cohen, and C. M. Oman, "Transfer function analysis of autonomic activity during motion sickness (abstract)", Aviat Space Environ Med, vol. 62, no. 5, 1991.