Aaslid, R; Markwalder, TM; Nornes, H (1982). "Noninvasive transcranial Doppler ultrasound recording of flow velocity in basal cerebral arteries". Journal of neurosurgery. 57 (6): 769–74. doi:10.3171/jns.1982.57.6.0769. PMID7143059.
nih.gov
ncbi.nlm.nih.gov
Aaslid, R; Markwalder, TM; Nornes, H (1982). "Noninvasive transcranial Doppler ultrasound recording of flow velocity in basal cerebral arteries". Journal of neurosurgery. 57 (6): 769–74. doi:10.3171/jns.1982.57.6.0769. PMID7143059.
"Assessment: Transcranial Doppler. Report of the American Academy of Neurology, Therapeutics and Technology Assessment Subcommittee". Neurology. 40 (4): 680–1. 1990. PMID2181340.