(en) Lena Zetterberg, Kjartan Halvorsen, Catarina Färnstrand, Sten-Magnus Aquilonius et Birgitta Lindmark, « Physiotherapy in cervical dystonia: Six experimental single-case studies », Physiotherapy Theory and Practice, vol. 24, no 4, , p. 275–90 (PMID18574753, DOI10.1080/09593980701884816).
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(en) Lena Zetterberg, Kjartan Halvorsen, Catarina Färnstrand, Sten-Magnus Aquilonius et Birgitta Lindmark, « Physiotherapy in cervical dystonia: Six experimental single-case studies », Physiotherapy Theory and Practice, vol. 24, no 4, , p. 275–90 (PMID18574753, DOI10.1080/09593980701884816).