* Challoner, A V J (1974. május 1.). „A photoelectric plethysmograph for the measurement of cutaneous blood flow”. Physics in Medicine and Biology19 (3), 317–328. o, Kiadó: IOP Publishing. DOI:10.1088/0031-9155/19/3/003. ISSN0031-9155.
* Challoner, A V J (1974. május 1.). „A photoelectric plethysmograph for the measurement of cutaneous blood flow”. Physics in Medicine and Biology19 (3), 317–328. o, Kiadó: IOP Publishing. DOI:10.1088/0031-9155/19/3/003. ISSN0031-9155.