C. J. Schankin, F. Maniyar, J. Hoffmann, D. Chou, P. J. Goadsby. Clinical characterization of “visual snow” (Positive Persistent Visual Disturbance) (англ.) // The Journal of Headache and Pain : journal. — 2013. — Vol. 14, no. S1. — ISSN1129-2369. — doi:10.1186/1129-2377-14-S1-P132.
C. J. Schankin, F. Maniyar, J. Hoffmann, D. Chou, P. J. Goadsby. Clinical characterization of “visual snow” (Positive Persistent Visual Disturbance) (англ.) // The Journal of Headache and Pain : journal. — 2013. — Vol. 14, no. S1. — ISSN1129-2369. — doi:10.1186/1129-2377-14-S1-P132.