HÄGGQVIST, Gösta. The Nervous Substratum of Muscle Tone. Acta Orthopaedica, [S. l.], v. 10, n. 1-4, p. 255–277, 1939. DOI: 10.3109/17453673909149505. Disponível em: https://actaorthop.org/actao/article/view/31247. Acesso em: 28 may. 2026.