OPPOLZER, "Krampf des Gesichtsnerven; Tic convulsif," Allgemeine wiener medicinische Zeitung, 1861, p. 73.
OWEN, "Spasmodic Wryneck treated by Resection of the Spinal Accessory Nerve," Lancet, June 18, 1892, p. 1361.
OZENNE, "Tic non douloureux de la face datant de trois ans chez un hérédo-syphilitique; guérison par le traitement hydrargyrique," Société de médecine et de chirurgie pratiques de Paris, February 6, 1902.
PAGET, "Cases of Morbid Rhythmical Movements, with Observations," Edinburgh Medical and Surgical Journal, January, 1847, p. 60.
(Contains many interesting references to the early literature.)
PARANT, "Les tics chez les aliénés," Congrès de Grenoble, 1902.
PARRY, "Cases of Spasmodic Torticollis," British Medical Journal, November 5, 1898, p. 1403.
PATELLA, "Studio anatomo, patologico e clinico sul policlono," Il policlinico, November, 1901, p. 535.
PATRICK, "Imperative Conceptions," New York Medical Journal, September 7, 1901, p. 445.
—— "Convulsive Tic," Journal of the American Medical Association, February 11, 1905.