1. Heisey SR, Adams T: Role of cranial bone mobility in cranial compliance. Neurosurgery. 1993, 33 (5): 869-876. 10.1097/00006123-199311000-00014.
2. Ueno T, Hargens AR, Ballard RE: Intracranial pressure dynamics during simulated microgravity: using a new noninvasive ultrasonic technique. J Gravitational Physiology. 1998, 5 (1): 39-40.
3. Ballard RE, Wilson M, Watenpaugh DE, Hargens AR, Shuer LM, Yost WT: Noninvasive measurement of intracranial volume and pressure using ultrasound. American Institute of Aeronautics and Astronautics Life Sciences and Space Medicine Conference. Book of Abstracts, Houston, TX. 1996, 76-77.
4. Ueno T, Ballard RE, Cantrell JH, Yost WT, Hargens AR: Noninvasive estimation of pulsatile intracranial pressure using ultrasound. NASA Technical Memorandum 112195. 1996
5. Ueno T, Ballard RE, Shuer LM, Yost WT, Cantrell , Hargens AR: Noninvasive measurement of pulsatile intracranial pressure using ultrasound. Acta Neurochir. 1998, 71 (Suppl): 66-69.