Heckmann, J G Transcranial Doppler sonography during acute 80° head-down tilt (HOT) for the assessment of cerebral autoregulation in humans. [electronic resource] - Neurological research Jul 1999 - 457-62 p. digital Publication Type: Journal Article ISSN: 0161-6412 Standard No.: 10.1080/01616412.1999.11740959 doi