A. M. Abd Rashid, M. S. F. . Md Noh, A. H. K. . Yusof Khan, M. N. . Mohd Yaakob, N. . Bahari, and H. Basri, “Unilateral loss of the swallow tail sign in a patient with idiopathic Parkinson’s disease”, CVNS, vol. 3, no. 3, pp. 59–62, Sep. 2021.